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

```c
unsigned alp;
main(c){
        while((c=getchar())!='\n') alp |= 1<<(c-'a');
        for(int i=0; i<26; i++) if(!((alp>>i)&1)) {
                putchar(i+'a');
                return 0;
        }
        puts("None");
        return 0;
}```

Assembly Code:

```assembly
	.file	"temp.c"
	.text
	.section	.rodata.str1.1,"aMS",@progbits,1
.LC0:
	.string	"None"
	.section	.text.startup,"ax",@progbits
	.p2align 4
	.globl	main
	.type	main, @function
main:
.LFB0:
	.cfi_startproc
	endbr64
	pushq	%rbx
	.cfi_def_cfa_offset 16
	.cfi_offset 3, -16
	movl	$1, %ebx
	jmp	.L2
	.p2align 4,,10
	.p2align 3
.L3:
	leal	-97(%rax), %ecx
	movl	%ebx, %eax
	sall	%cl, %eax
	orl	%eax, alp(%rip)
.L2:
	xorl	%eax, %eax
	call	getchar@PLT
	cmpl	$10, %eax
	jne	.L3
	movl	alp(%rip), %eax
	xorl	%edi, %edi
	jmp	.L6
	.p2align 4,,10
	.p2align 3
.L4:
	addl	$1, %edi
	cmpl	$26, %edi
	je	.L10
.L6:
	btl	%edi, %eax
	jc	.L4
	addl	$97, %edi
	call	putchar@PLT
.L5:
	xorl	%eax, %eax
	popq	%rbx
	.cfi_remember_state
	.cfi_def_cfa_offset 8
	ret
.L10:
	.cfi_restore_state
	leaq	.LC0(%rip), %rdi
	call	puts@PLT
	jmp	.L5
	.cfi_endproc
.LFE0:
	.size	main, .-main
	.globl	alp
	.bss
	.align 4
	.type	alp, @object
	.size	alp, 4
alp:
	.zero	4
	.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	"None"
	.section	.text.startup,"ax",@progbits
	.p2align 4
	.globl	main
	.type	main, @function
main:
.LFB0:
	.cfi_startproc
	endbr64
	pushq	%rbx
	.cfi_def_cfa_offset 16
	.cfi_offset 3, -16
	movl	$1, %ebx
	jmp	.L2
	.p2align 4,,10
	.p2align 3
.L3:
	leal	-97(%rax), %ecx
	movl	%ebx, %eax
	sall	%cl, %eax
	orl	%eax, alp(%rip)
.L2:
	xorl	%eax, %eax
	call	getchar@PLT
	cmpl	$10, %eax
	jne	.L3
	movl	alp(%rip), %eax
	xorl	%edi, %edi
	jmp	.L6
	.p2align 4,,10
	.p2align 3
.L4:
	addl	$1, %edi
	cmpl	$26, %edi
	je	.L10
.L6:
	btl	%edi, %eax
	jc	.L4
	addl	$97, %edi
	call	putchar@PLT
.L5:
	xorl	%eax, %eax
	popq	%rbx
	.cfi_remember_state
	.cfi_def_cfa_offset 8
	ret
.L10:
	.cfi_restore_state
	leaq	.LC0(%rip), %rdi
	call	puts@PLT
	jmp	.L5
	.cfi_endproc
.LFE0:
	.size	main, .-main
	.globl	alp
	.bss
	.align 4
	.type	alp, @object
	.size	alp, 4
alp:
	.zero	4
	.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	"None"
	.section	.text.startup,"ax",@progbits
	.p2align 4
	.globl	main
	.type	main, @function
main:
.LFB0:
	.cfi_startproc
	endbr64
	pushq	%rbx
	.cfi_def_cfa_offset 16
	.cfi_offset 3, -16
	movl	$1, %ebx
	jmp	.L2
	.p2align 4,,10
	.p2align 3
.L3:
	leal	-97(%rax), %ecx
	movl	%ebx, %eax
	sall	%cl, %eax
	orl	%eax, alp(%rip)
.L2:
	xorl	%eax, %eax
	call	getchar@PLT
	cmpl	$10, %eax
	jne	.L3
	movl	alp(%rip), %eax
	xorl	%edi, %edi
	jmp	.L6
	.p2align 4,,10
	.p2align 3
.L4:
	addl	$1, %edi
	cmpl	$26, %edi
	je	.L10
.L6:
	btl	%edi, %eax
	jc	.L4
	addl	$97, %edi
	call	putchar@PLT
.L5:
	xorl	%eax, %eax
	popq	%rbx
	.cfi_remember_state
	.cfi_def_cfa_offset 8
	ret
.L10:
	.cfi_restore_state
	leaq	.LC0(%rip), %rdi
	call	puts@PLT
	jmp	.L5
	.cfi_endproc
.LFE0:
	.size	main, .-main
	.globl	alp
	.bss
	.align 4
	.type	alp, @object
	.size	alp, 4
alp:
	.zero	4
	.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
unsigned alp;
main(c){
        while((c=getchar())!='\n') alp |= 1<<(c-'a');
        for(int i=0; i<26; i++) if(!((alp>>i)&1)) {
                putchar(i+'a');
                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
unsigned alp;
main(c){
        while((c=getchar())!='\n') alp |= 1<<(c-'a');
        for(int i=0; i<26; i++) if(!((alp>>i)&1)) {
                putchar(i+'a');
                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
unsigned alp;
main(c){
        while((c=getchar())!='\n') alp |= 1<<(c-'a');
        for(int i=0; i<26; i++) if(!((alp>>i)&1)) {
                putchar(i+'a');
                return 0;
        }
        puts("None");
        return 0;
}```

Assembly Code:

```assembly
	.file	"temp.c"
	.text
	.section	.rodata.str1.1,"aMS",@progbits,1
.LC0:
	.string	"None"
	.section	.text.startup,"ax",@progbits
	.p2align 4
	.globl	main
	.type	main, @function
main:
.LFB0:
	.cfi_startproc
	endbr64
	pushq	%rbx
	.cfi_def_cfa_offset 16
	.cfi_offset 3, -16
	movl	$1, %ebx
	jmp	.L2
	.p2align 4,,10
	.p2align 3
.L3:
	leal	-97(%rax), %ecx
	movl	%ebx, %eax
	sall	%cl, %eax
	orl	%eax, alp(%rip)
.L2:
	xorl	%eax, %eax
	call	getchar@PLT
	cmpl	$10, %eax
	jne	.L3
	movl	alp(%rip), %eax
	xorl	%edi, %edi
	jmp	.L6
	.p2align 4,,10
	.p2align 3
.L4:
	addl	$1, %edi
	cmpl	$26, %edi
	je	.L10
.L6:
	btl	%edi, %eax
	jc	.L4
	addl	$97, %edi
	call	putchar@PLT
.L5:
	xorl	%eax, %eax
	popq	%rbx
	.cfi_remember_state
	.cfi_def_cfa_offset 8
	ret
.L10:
	.cfi_restore_state
	leaq	.LC0(%rip), %rdi
	call	puts@PLT
	jmp	.L5
	.cfi_endproc
.LFE0:
	.size	main, .-main
	.globl	alp
	.bss
	.align 4
	.type	alp, @object
	.size	alp, 4
alp:
	.zero	4
	.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	"None"
	.section	.text.startup,"ax",@progbits
	.p2align 4
	.globl	main
	.type	main, @function
main:
.LFB0:
	.cfi_startproc
	endbr64
	pushq	%rbx
	.cfi_def_cfa_offset 16
	.cfi_offset 3, -16
	movl	$1, %ebx
	jmp	.L2
	.p2align 4,,10
	.p2align 3
.L3:
	leal	-97(%rax), %ecx
	movl	%ebx, %eax
	sall	%cl, %eax
	orl	%eax, alp(%rip)
.L2:
	xorl	%eax, %eax
	call	getchar@PLT
	cmpl	$10, %eax
	jne	.L3
	movl	alp(%rip), %eax
	xorl	%edi, %edi
	jmp	.L6
	.p2align 4,,10
	.p2align 3
.L4:
	addl	$1, %edi
	cmpl	$26, %edi
	je	.L10
.L6:
	btl	%edi, %eax
	jc	.L4
	addl	$97, %edi
	call	putchar@PLT
.L5:
	xorl	%eax, %eax
	popq	%rbx
	.cfi_remember_state
	.cfi_def_cfa_offset 8
	ret
.L10:
	.cfi_restore_state
	leaq	.LC0(%rip), %rdi
	call	puts@PLT
	jmp	.L5
	.cfi_endproc
.LFE0:
	.size	main, .-main
	.globl	alp
	.bss
	.align 4
	.type	alp, @object
	.size	alp, 4
alp:
	.zero	4
	.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:
```