Given the following C code and assembly code, your task is to generate highly optimized x86-64 assembly code.
C Code:

```c
#include<stdio.h>
#include<string.h>
int main(){
  char s[100002];
  int alphabet[27];
  scanf("%s",s);
  int len=strlen(s),i;
  for(i=0;i<26;i++)
    alphabet[i]=0;
  for(i=0;i<len;i++)
    alphabet[s[i]-'a']++;
  for(i=0;i<26;i++)
    if(alphabet[i]==0){
      printf("%c\n",'a'+i);
      return 0;
    }
  puts("None");
  return 0;
}
```

Assembly Code:

```assembly
	.file	"temp.c"
	.text
	.section	.rodata.str1.1,"aMS",@progbits,1
.LC0:
	.string	"%s"
.LC1:
	.string	"%c\n"
.LC2:
	.string	"None"
	.section	.text.startup,"ax",@progbits
	.p2align 4
	.globl	main
	.type	main, @function
main:
.LFB35:
	.cfi_startproc
	endbr64
	pushq	%rbx
	.cfi_def_cfa_offset 16
	.cfi_offset 3, -16
	leaq	-98304(%rsp), %r11
	.cfi_def_cfa 11, 98320
.LPSRL0:
	subq	$4096, %rsp
	orq	$0, (%rsp)
	cmpq	%r11, %rsp
	jne	.LPSRL0
	.cfi_def_cfa_register 7
	subq	$1824, %rsp
	.cfi_def_cfa_offset 100144
	leaq	.LC0(%rip), %rdi
	movq	%fs:40, %rax
	movq	%rax, 100120(%rsp)
	xorl	%eax, %eax
	leaq	112(%rsp), %rbx
	movq	%rbx, %rsi
	call	__isoc99_scanf@PLT
	movq	%rbx, %rdi
	call	strlen@PLT
	movq	%rsp, %rsi
	movl	$13, %ecx
	movq	%rax, %r8
	movq	%rsi, %rdi
	xorl	%eax, %eax
	rep stosq
	testq	%r8, %r8
	je	.L2
	leal	-1(%r8), %eax
	movq	%rbx, %rdx
	leaq	113(%rsp,%rax), %rcx
	.p2align 4,,10
	.p2align 3
.L3:
	movsbl	(%rdx), %eax
	addq	$1, %rdx
	subl	$97, %eax
	cltq
	addl	$1, (%rsp,%rax,4)
	cmpq	%rdx, %rcx
	jne	.L3
.L2:
	xorl	%eax, %eax
	jmp	.L6
	.p2align 4,,10
	.p2align 3
.L4:
	addq	$1, %rax
	cmpq	$26, %rax
	je	.L15
.L6:
	movl	(%rsi,%rax,4), %ecx
	movl	%eax, %edx
	testl	%ecx, %ecx
	jne	.L4
	addl	$97, %edx
	leaq	.LC1(%rip), %rsi
	movl	$1, %edi
	xorl	%eax, %eax
	call	__printf_chk@PLT
.L5:
	movq	100120(%rsp), %rax
	subq	%fs:40, %rax
	jne	.L16
	addq	$100128, %rsp
	.cfi_remember_state
	.cfi_def_cfa_offset 16
	xorl	%eax, %eax
	popq	%rbx
	.cfi_def_cfa_offset 8
	ret
.L15:
	.cfi_restore_state
	leaq	.LC2(%rip), %rdi
	call	puts@PLT
	jmp	.L5
.L16:
	call	__stack_chk_fail@PLT
	.cfi_endproc
.LFE35:
	.size	main, .-main
	.ident	"GCC: (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0"
	.section	.note.GNU-stack,"",@progbits
	.section	.note.gnu.property,"a"
	.align 8
	.long	1f - 0f
	.long	4f - 1f
	.long	5
0:
	.string	"GNU"
1:
	.align 8
	.long	0xc0000002
	.long	3f - 2f
2:
	.long	0x3
3:
	.align 8
4:
```

Only output the optimized assembly code. Do not include any other text. Do not write any comments in the assembly code. Wrap the assembly code in ```assembly``` tags.
Optimized Assembly Code:

user
```assembly
	.file	"temp.c"
	.text
	.section	.rodata.str1.1,"aMS",@progbits,1
.LC0:
	.string	"%s"
.LC1:
	.string	"%c\n"
.LC2:
	.string	"None"
	.section	.text.startup,"ax",@progbits
	.p2align 4
	.globl	main
	.type	main, @function
main:
.LFB35:
	.cfi_startproc
	endbr64
	pushq	%rbx
	.cfi_def_cfa_offset 16
	.cfi_offset 3, -16
	leaq	-98304(%rsp), %r11
	.cfi_def_cfa 11, 98320
.LPSRL0:
	subq	$4096, %rsp
	orq	$0, (%rsp)
	cmpq	%r11, %rsp
	jne	.LPSRL0
	.cfi_def_cfa_register 7
	subq	$1824, %rsp
	.cfi_def_cfa_offset 100144
	leaq	.LC0(%rip), %rdi
	movq	%fs:40, %rax
	movq	%rax, 100120(%rsp)
	xorl	%eax, %eax
	leaq	112(%rsp), %rbx
	movq	%rbx, %rsi
	call	__isoc99_scanf@PLT
	movq	%rbx, %rdi
	call	strlen@PLT
	movq	%rsp, %rsi
	movl	$13, %ecx
	movq	%rax, %r8
	movq	%rsi, %rdi
	xorl	%eax, %eax
	rep stosq
	testq	%r8, %r8
	je	.L2
	leal	-1(%r8), %eax
	movq	%rbx, %rdx
	leaq	113(%rsp,%rax), %rcx
	.p2align 4,,10
	.p2align 3
.L3:
	movsbl	(%rdx), %eax
	addq	$1, %rdx
	subl	$97, %eax
	cltq
	addl	$1, (%rsp,%rax,4)
	cmpq	%rdx, %rcx
	jne	.L3
.L2:
	xorl	%eax, %eax
	jmp	.L6
	.p2align 4,,10
	.p2align 3
.L4:
	addq	$1, %rax
	cmpq	$26, %rax
	je	.L15
.L6:
	movl	(%rsi,%rax,4), %ecx
	movl	%eax, %edx
	testl	%ecx, %ecx
	jne	.L4
	addl	$97, %edx
	leaq	.LC1(%rip), %rsi
	movl	$1, %edi
	xorl	%eax, %eax
	call	__printf_chk@PLT
.L5:
	movq	100120(%rsp), %rax
	subq	%fs:40, %rax
	jne	.L16
	addq	$100128, %rsp
	.cfi_remember_state
	.cfi_def_cfa_offset 16
	xorl	%eax, %eax
	popq	%rbx
	.cfi_def_cfa_offset 8
	ret
.L15:
	.cfi_restore_state
	leaq	.LC2(%rip), %rdi
	call	puts@PLT
	jmp	.L5
.L16:
	call	__stack_chk_fail@PLT
	.cfi_endproc
.LFE35:
	.size	main, .-main
	.ident	"GCC: (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0"
	.section	.note.GNU-stack,"",@progbits
	.section	.note.gnu.property,"a"
	.align 8
	.long	1f - 0f
	.long	4f - 1f
	.long	5
0:
	.string	"GNU"
1:
	.align 8
	.long	0xc0000002
	.long	3f - 2f
2:
	.long	0x3
3:
	.align 8
4:
```
rule
```assembly
	.file	"temp.c"
	.text
	.section	.rodata.str1.1,"aMS",@progbits,1
.LC0:
	.string	"%s"
.LC1:
	.string	"%c\n"
.LC2:
	.string	"None"
	.section	.text.startup,"ax",@progbits
	.p2align 4
	.globl	main
	.type	main, @function
main:
.LFB35:
	.cfi_startproc
	endbr64
	pushq	%rbx
	.cfi_def_cfa_offset 16
	.cfi_offset 3, -16
	leaq	-98304(%rsp), %r11
	.cfi_def_cfa 11, 98320
.LPSRL0:
	subq	$4096, %rsp
	orq	$0, (%rsp)
	cmpq	%r11, %rsp
	jne	.LPSRL0
	.cfi_def_cfa_register 7
	subq	$1824, %rsp
	.cfi_def_cfa_offset 100144
	leaq	.LC0(%rip), %rdi
	movq	%fs:40, %rax
	movq	%rax, 100120(%rsp)
	xorl	%eax, %eax
	leaq	112(%rsp), %rbx
	movq	%rbx, %rsi
	call	__isoc99_scanf@PLT
	movq	%rbx, %rdi
	call	strlen@PLT
	movq	%rsp, %rsi
	movl	$13, %ecx
	movq	%rax, %r8
	movq	%rsi, %rdi
	xorl	%eax, %eax
	rep stosq
	testq	%r8, %r8
	je	.L2
	leal	-1(%r8), %eax
	movq	%rbx, %rdx
	leaq	113(%rsp,%rax), %rcx
	.p2align 4,,10
	.p2align 3
.L3:
	movsbl	(%rdx), %eax
	addq	$1, %rdx
	subl	$97, %eax
	cltq
	addl	$1, (%rsp,%rax,4)
	cmpq	%rdx, %rcx
	jne	.L3
.L2:
	xorl	%eax, %eax
	jmp	.L6
	.p2align 4,,10
	.p2align 3
.L4:
	addq	$1, %rax
	cmpq	$26, %rax
	je	.L15
.L6:
	movl	(%rsi,%rax,4), %ecx
	movl	%eax, %edx
	testl	%ecx, %ecx
	jne	.L4
	addl	$97, %edx
	leaq	.LC1(%rip), %rsi
	movl	$1, %edi
	xorl	%eax, %eax
	call	__printf_chk@PLT
.L5:
	movq	100120(%rsp), %rax
	subq	%fs:40, %rax
	jne	.L16
	addq	$100128, %rsp
	.cfi_remember_state
	.cfi_def_cfa_offset 16
	xorl	%eax, %eax
	popq	%rbx
	.cfi_def_cfa_offset 8
	ret
.L15:
	.cfi_restore_state
	leaq	.LC2(%rip), %rdi
	call	puts@PLT
	jmp	.L5
.L16:
	call	__stack_chk_fail@PLT
	.cfi_endproc
.LFE35:
	.size	main, .-main
	.ident	"GCC: (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0"
	.section	.note.GNU-stack,"",@progbits
	.section	.note.gnu.property,"a"
	.align 8
	.long	1f - 0f
	.long	4f - 1f
	.long	5
0:
	.string	"GNU"
1:
	.align 8
	.long	0xc0000002
	.long	3f - 2f
2:
	.long	0x3
3:
	.align 8
4:
```
```c
#include<stdio.h>
#include<string.h>
int main(){
  char s[100002];
  int alphabet[27];
  scanf("%s",s);
  int len=strlen(s),i;
  for(i=0;i<26;i++)
    alphabet[i]=0;
  for(i=0;i<len;i++)
    alphabet[s[i]-'a']++;
  for(i=0;i<26;i++)
    if(alphabet[i]==0){
      printf("%c\n",'a'+i);
      return 0;
    }
  puts("None");
  return 0;
}
```
Given the following C code, your task is to generate highly optimized x86-64 assembly code.
C Code:

```c
#include<stdio.h>
#include<string.h>
int main(){
  char s[100002];
  int alphabet[27];
  scanf("%s",s);
  int len=strlen(s),i;
  for(i=0;i<26;i++)
    alphabet[i]=0;
  for(i=0;i<len;i++)
    alphabet[s[i]-'a']++;
  for(i=0;i<26;i++)
    if(alphabet[i]==0){
      printf("%c\n",'a'+i);
      return 0;
    }
  puts("None");
  return 0;
}
```

Only output the optimized assembly code. Do not include any other text. Do not write any comments in the assembly code. Wrap the assembly code in ```assembly``` tags.
Optimized Assembly Code:

atcoderregularcontest

b

Given the following C code and assembly code, your task is to generate highly optimized x86-64 assembly code.
C Code:

```c
#include<stdio.h>
#include<string.h>
int main(){
  char s[100002];
  int alphabet[27];
  scanf("%s",s);
  int len=strlen(s),i;
  for(i=0;i<26;i++)
    alphabet[i]=0;
  for(i=0;i<len;i++)
    alphabet[s[i]-'a']++;
  for(i=0;i<26;i++)
    if(alphabet[i]==0){
      printf("%c\n",'a'+i);
      return 0;
    }
  puts("None");
  return 0;
}
```

Assembly Code:

```assembly
	.file	"temp.c"
	.text
	.section	.rodata.str1.1,"aMS",@progbits,1
.LC0:
	.string	"%s"
.LC1:
	.string	"%c\n"
.LC2:
	.string	"None"
	.section	.text.startup,"ax",@progbits
	.p2align 4
	.globl	main
	.type	main, @function
main:
.LFB35:
	.cfi_startproc
	endbr64
	pushq	%rbx
	.cfi_def_cfa_offset 16
	.cfi_offset 3, -16
	leaq	-98304(%rsp), %r11
	.cfi_def_cfa 11, 98320
.LPSRL0:
	subq	$4096, %rsp
	orq	$0, (%rsp)
	cmpq	%r11, %rsp
	jne	.LPSRL0
	.cfi_def_cfa_register 7
	subq	$1824, %rsp
	.cfi_def_cfa_offset 100144
	leaq	.LC0(%rip), %rdi
	movq	%fs:40, %rax
	movq	%rax, 100120(%rsp)
	xorl	%eax, %eax
	leaq	112(%rsp), %rbx
	movq	%rbx, %rsi
	call	__isoc99_scanf@PLT
	movq	%rbx, %rdi
	call	strlen@PLT
	movq	%rsp, %rsi
	movl	$13, %ecx
	movq	%rax, %r8
	movq	%rsi, %rdi
	xorl	%eax, %eax
	rep stosq
	testq	%r8, %r8
	je	.L2
	leal	-1(%r8), %eax
	movq	%rbx, %rdx
	leaq	113(%rsp,%rax), %rcx
	.p2align 4,,10
	.p2align 3
.L3:
	movsbl	(%rdx), %eax
	addq	$1, %rdx
	subl	$97, %eax
	cltq
	addl	$1, (%rsp,%rax,4)
	cmpq	%rdx, %rcx
	jne	.L3
.L2:
	xorl	%eax, %eax
	jmp	.L6
	.p2align 4,,10
	.p2align 3
.L4:
	addq	$1, %rax
	cmpq	$26, %rax
	je	.L15
.L6:
	movl	(%rsi,%rax,4), %ecx
	movl	%eax, %edx
	testl	%ecx, %ecx
	jne	.L4
	addl	$97, %edx
	leaq	.LC1(%rip), %rsi
	movl	$1, %edi
	xorl	%eax, %eax
	call	__printf_chk@PLT
.L5:
	movq	100120(%rsp), %rax
	subq	%fs:40, %rax
	jne	.L16
	addq	$100128, %rsp
	.cfi_remember_state
	.cfi_def_cfa_offset 16
	xorl	%eax, %eax
	popq	%rbx
	.cfi_def_cfa_offset 8
	ret
.L15:
	.cfi_restore_state
	leaq	.LC2(%rip), %rdi
	call	puts@PLT
	jmp	.L5
.L16:
	call	__stack_chk_fail@PLT
	.cfi_endproc
.LFE35:
	.size	main, .-main
	.ident	"GCC: (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0"
	.section	.note.GNU-stack,"",@progbits
	.section	.note.gnu.property,"a"
	.align 8
	.long	1f - 0f
	.long	4f - 1f
	.long	5
0:
	.string	"GNU"
1:
	.align 8
	.long	0xc0000002
	.long	3f - 2f
2:
	.long	0x3
3:
	.align 8
4:
```

Only output the optimized assembly code. Do not include any other text. Do not write any comments in the assembly code. Wrap the assembly code in ```assembly``` tags.
Optimized Assembly Code:

train
```assembly
	.file	"temp.c"
	.text
	.section	.rodata.str1.1,"aMS",@progbits,1
.LC0:
	.string	"%s"
.LC1:
	.string	"%c\n"
.LC2:
	.string	"None"
	.section	.text.startup,"ax",@progbits
	.p2align 4
	.globl	main
	.type	main, @function
main:
.LFB35:
	.cfi_startproc
	endbr64
	pushq	%rbx
	.cfi_def_cfa_offset 16
	.cfi_offset 3, -16
	leaq	-98304(%rsp), %r11
	.cfi_def_cfa 11, 98320
.LPSRL0:
	subq	$4096, %rsp
	orq	$0, (%rsp)
	cmpq	%r11, %rsp
	jne	.LPSRL0
	.cfi_def_cfa_register 7
	subq	$1824, %rsp
	.cfi_def_cfa_offset 100144
	leaq	.LC0(%rip), %rdi
	movq	%fs:40, %rax
	movq	%rax, 100120(%rsp)
	xorl	%eax, %eax
	leaq	112(%rsp), %rbx
	movq	%rbx, %rsi
	call	__isoc99_scanf@PLT
	movq	%rbx, %rdi
	call	strlen@PLT
	movq	%rsp, %rsi
	movl	$13, %ecx
	movq	%rax, %r8
	movq	%rsi, %rdi
	xorl	%eax, %eax
	rep stosq
	testq	%r8, %r8
	je	.L2
	leal	-1(%r8), %eax
	movq	%rbx, %rdx
	leaq	113(%rsp,%rax), %rcx
	.p2align 4,,10
	.p2align 3
.L3:
	movsbl	(%rdx), %eax
	addq	$1, %rdx
	subl	$97, %eax
	cltq
	addl	$1, (%rsp,%rax,4)
	cmpq	%rdx, %rcx
	jne	.L3
.L2:
	xorl	%eax, %eax
	jmp	.L6
	.p2align 4,,10
	.p2align 3
.L4:
	addq	$1, %rax
	cmpq	$26, %rax
	je	.L15
.L6:
	movl	(%rsi,%rax,4), %ecx
	movl	%eax, %edx
	testl	%ecx, %ecx
	jne	.L4
	addl	$97, %edx
	leaq	.LC1(%rip), %rsi
	movl	$1, %edi
	xorl	%eax, %eax
	call	__printf_chk@PLT
.L5:
	movq	100120(%rsp), %rax
	subq	%fs:40, %rax
	jne	.L16
	addq	$100128, %rsp
	.cfi_remember_state
	.cfi_def_cfa_offset 16
	xorl	%eax, %eax
	popq	%rbx
	.cfi_def_cfa_offset 8
	ret
.L15:
	.cfi_restore_state
	leaq	.LC2(%rip), %rdi
	call	puts@PLT
	jmp	.L5
.L16:
	call	__stack_chk_fail@PLT
	.cfi_endproc
.LFE35:
	.size	main, .-main
	.ident	"GCC: (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0"
	.section	.note.GNU-stack,"",@progbits
	.section	.note.gnu.property,"a"
	.align 8
	.long	1f - 0f
	.long	4f - 1f
	.long	5
0:
	.string	"GNU"
1:
	.align 8
	.long	0xc0000002
	.long	3f - 2f
2:
	.long	0x3
3:
	.align 8
4:
```