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>

main()
{
	char buf[2000];
	int i = 0;
	
	
	scanf("%[^\n]",buf);
	
	while(buf[i] != '\0'){
		if('A' <= buf[i] && buf[i] <= 'Z'){
			printf("%c",buf[i] + ('a'-'A'));
		} else if('a'<=buf[i] && buf[i] <= 'z'){
			printf("%c",buf[i]-('a'-'A'));
		} else {
			printf("%c",buf[i]);
		}
		i++;
	}
	printf("\n");
	return 0;
}
	```

Assembly Code:

```assembly
	.file	"temp.c"
	.text
	.section	.rodata.str1.1,"aMS",@progbits,1
.LC0:
	.string	"%[^\n]"
	.section	.text.startup,"ax",@progbits
	.p2align 4
	.globl	main
	.type	main, @function
main:
.LFB23:
	.cfi_startproc
	endbr64
	pushq	%rbx
	.cfi_def_cfa_offset 16
	.cfi_offset 3, -16
	leaq	.LC0(%rip), %rdi
	subq	$2016, %rsp
	.cfi_def_cfa_offset 2032
	movq	%fs:40, %rax
	movq	%rax, 2008(%rsp)
	xorl	%eax, %eax
	movq	%rsp, %rsi
	call	__isoc99_scanf@PLT
	movsbl	(%rsp), %edi
	testb	%dil, %dil
	je	.L2
	leaq	1(%rsp), %rbx
	jmp	.L6
	.p2align 4,,10
	.p2align 3
.L15:
	subl	$32, %edi
	movsbl	%dil, %edi
	call	putchar@PLT
.L4:
	movsbl	(%rbx), %edi
	addq	$1, %rbx
	testb	%dil, %dil
	je	.L2
.L6:
	leal	-65(%rdi), %eax
	cmpb	$25, %al
	jbe	.L14
	leal	-97(%rdi), %eax
	cmpb	$25, %al
	jbe	.L15
	call	putchar@PLT
	movsbl	(%rbx), %edi
	addq	$1, %rbx
	testb	%dil, %dil
	jne	.L6
.L2:
	movl	$10, %edi
	call	putchar@PLT
	movq	2008(%rsp), %rax
	subq	%fs:40, %rax
	jne	.L16
	addq	$2016, %rsp
	.cfi_remember_state
	.cfi_def_cfa_offset 16
	xorl	%eax, %eax
	popq	%rbx
	.cfi_def_cfa_offset 8
	ret
	.p2align 4,,10
	.p2align 3
.L14:
	.cfi_restore_state
	addl	$32, %edi
	movsbl	%dil, %edi
	call	putchar@PLT
	jmp	.L4
.L16:
	call	__stack_chk_fail@PLT
	.cfi_endproc
.LFE23:
	.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	"%[^\n]"
	.section	.text.startup,"ax",@progbits
	.p2align 4
	.globl	main
	.type	main, @function
main:
.LFB23:
	.cfi_startproc
	endbr64
	pushq	%rbx
	.cfi_def_cfa_offset 16
	.cfi_offset 3, -16
	leaq	.LC0(%rip), %rdi
	subq	$2016, %rsp
	.cfi_def_cfa_offset 2032
	movq	%fs:40, %rax
	movq	%rax, 2008(%rsp)
	xorl	%eax, %eax
	movq	%rsp, %rsi
	call	__isoc99_scanf@PLT
	movsbl	(%rsp), %edi
	testb	%dil, %dil
	je	.L2
	leaq	1(%rsp), %rbx
	jmp	.L6
	.p2align 4,,10
	.p2align 3
.L15:
	subl	$32, %edi
	movsbl	%dil, %edi
	call	putchar@PLT
.L4:
	movsbl	(%rbx), %edi
	addq	$1, %rbx
	testb	%dil, %dil
	je	.L2
.L6:
	leal	-65(%rdi), %eax
	cmpb	$25, %al
	jbe	.L14
	leal	-97(%rdi), %eax
	cmpb	$25, %al
	jbe	.L15
	call	putchar@PLT
	movsbl	(%rbx), %edi
	addq	$1, %rbx
	testb	%dil, %dil
	jne	.L6
.L2:
	movl	$10, %edi
	call	putchar@PLT
	movq	2008(%rsp), %rax
	subq	%fs:40, %rax
	jne	.L16
	addq	$2016, %rsp
	.cfi_remember_state
	.cfi_def_cfa_offset 16
	xorl	%eax, %eax
	popq	%rbx
	.cfi_def_cfa_offset 8
	ret
	.p2align 4,,10
	.p2align 3
.L14:
	.cfi_restore_state
	addl	$32, %edi
	movsbl	%dil, %edi
	call	putchar@PLT
	jmp	.L4
.L16:
	call	__stack_chk_fail@PLT
	.cfi_endproc
.LFE23:
	.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	"%[^\n]"
	.section	.text.startup,"ax",@progbits
	.p2align 4
	.globl	main
	.type	main, @function
main:
.LFB23:
	.cfi_startproc
	endbr64
	pushq	%rbx
	.cfi_def_cfa_offset 16
	.cfi_offset 3, -16
	leaq	.LC0(%rip), %rdi
	subq	$2016, %rsp
	.cfi_def_cfa_offset 2032
	movq	%fs:40, %rax
	movq	%rax, 2008(%rsp)
	xorl	%eax, %eax
	movq	%rsp, %rsi
	call	__isoc99_scanf@PLT
	movsbl	(%rsp), %edi
	testb	%dil, %dil
	je	.L2
	leaq	1(%rsp), %rbx
	jmp	.L6
	.p2align 4,,10
	.p2align 3
.L15:
	subl	$32, %edi
	movsbl	%dil, %edi
	call	putchar@PLT
.L4:
	movsbl	(%rbx), %edi
	addq	$1, %rbx
	testb	%dil, %dil
	je	.L2
.L6:
	leal	-65(%rdi), %eax
	cmpb	$25, %al
	jbe	.L14
	leal	-97(%rdi), %eax
	cmpb	$25, %al
	jbe	.L15
	call	putchar@PLT
	movsbl	(%rbx), %edi
	addq	$1, %rbx
	testb	%dil, %dil
	jne	.L6
.L2:
	movl	$10, %edi
	call	putchar@PLT
	movq	2008(%rsp), %rax
	subq	%fs:40, %rax
	jne	.L16
	addq	$2016, %rsp
	.cfi_remember_state
	.cfi_def_cfa_offset 16
	xorl	%eax, %eax
	popq	%rbx
	.cfi_def_cfa_offset 8
	ret
	.p2align 4,,10
	.p2align 3
.L14:
	.cfi_restore_state
	addl	$32, %edi
	movsbl	%dil, %edi
	call	putchar@PLT
	jmp	.L4
.L16:
	call	__stack_chk_fail@PLT
	.cfi_endproc
.LFE23:
	.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>

main()
{
	char buf[2000];
	int i = 0;
	
	
	scanf("%[^\n]",buf);
	
	while(buf[i] != '\0'){
		if('A' <= buf[i] && buf[i] <= 'Z'){
			printf("%c",buf[i] + ('a'-'A'));
		} else if('a'<=buf[i] && buf[i] <= 'z'){
			printf("%c",buf[i]-('a'-'A'));
		} else {
			printf("%c",buf[i]);
		}
		i++;
	}
	printf("\n");
	return 0;
}
	```
Given the following C code, your task is to generate highly optimized x86-64 assembly code.
C Code:

```c
#include<stdio.h>

main()
{
	char buf[2000];
	int i = 0;
	
	
	scanf("%[^\n]",buf);
	
	while(buf[i] != '\0'){
		if('A' <= buf[i] && buf[i] <= 'Z'){
			printf("%c",buf[i] + ('a'-'A'));
		} else if('a'<=buf[i] && buf[i] <= 'z'){
			printf("%c",buf[i]-('a'-'A'));
		} else {
			printf("%c",buf[i]);
		}
		i++;
	}
	printf("\n");
	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:

f@IR, LATER, OCCASIONALLY CLOUDY.
 f@IR, LATER, YLLANOISACCO CLOUDY.
 f@IR, LATER, OLLANOISACCY CLOUDY.
 f@IR, LATER, OLKANOISACCY CLOUDY.
 ,RI@f LATER, OLKANOISACCY CLOUDY.
 ,RI@f KATER, OLKANOISACCY CLOUDY.
 ,RI@g KATER, OLKANOISACCY CLOUDY.
 ,RI@g KATER, OLKANOISACCY CLOUDX.
 ,RI@g KATFR, OLKANOISACCY CLOUDX.
 ,RI@g KATFR, OLKANOISACCY .XDUOLC

F@ir, later, occasionally cloudy.
 F@ir, later, yllanoisacco cloudy.
 F@ir, later, ollanoisaccy cloudy.
 F@ir, later, olkanoisaccy cloudy.
 ,ri@F later, olkanoisaccy cloudy.
 ,ri@F kater, olkanoisaccy cloudy.
 ,ri@G kater, olkanoisaccy cloudy.
 ,ri@G kater, olkanoisaccy cloudx.
 ,ri@G katfr, olkanoisaccy cloudx.
 ,ri@G katfr, olkanoisaccy .xduolc

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>

main()
{
	char buf[2000];
	int i = 0;
	
	
	scanf("%[^\n]",buf);
	
	while(buf[i] != '\0'){
		if('A' <= buf[i] && buf[i] <= 'Z'){
			printf("%c",buf[i] + ('a'-'A'));
		} else if('a'<=buf[i] && buf[i] <= 'z'){
			printf("%c",buf[i]-('a'-'A'));
		} else {
			printf("%c",buf[i]);
		}
		i++;
	}
	printf("\n");
	return 0;
}
	```

Assembly Code:

```assembly
	.file	"temp.c"
	.text
	.section	.rodata.str1.1,"aMS",@progbits,1
.LC0:
	.string	"%[^\n]"
	.section	.text.startup,"ax",@progbits
	.p2align 4
	.globl	main
	.type	main, @function
main:
.LFB23:
	.cfi_startproc
	endbr64
	pushq	%rbx
	.cfi_def_cfa_offset 16
	.cfi_offset 3, -16
	leaq	.LC0(%rip), %rdi
	subq	$2016, %rsp
	.cfi_def_cfa_offset 2032
	movq	%fs:40, %rax
	movq	%rax, 2008(%rsp)
	xorl	%eax, %eax
	movq	%rsp, %rsi
	call	__isoc99_scanf@PLT
	movsbl	(%rsp), %edi
	testb	%dil, %dil
	je	.L2
	leaq	1(%rsp), %rbx
	jmp	.L6
	.p2align 4,,10
	.p2align 3
.L15:
	subl	$32, %edi
	movsbl	%dil, %edi
	call	putchar@PLT
.L4:
	movsbl	(%rbx), %edi
	addq	$1, %rbx
	testb	%dil, %dil
	je	.L2
.L6:
	leal	-65(%rdi), %eax
	cmpb	$25, %al
	jbe	.L14
	leal	-97(%rdi), %eax
	cmpb	$25, %al
	jbe	.L15
	call	putchar@PLT
	movsbl	(%rbx), %edi
	addq	$1, %rbx
	testb	%dil, %dil
	jne	.L6
.L2:
	movl	$10, %edi
	call	putchar@PLT
	movq	2008(%rsp), %rax
	subq	%fs:40, %rax
	jne	.L16
	addq	$2016, %rsp
	.cfi_remember_state
	.cfi_def_cfa_offset 16
	xorl	%eax, %eax
	popq	%rbx
	.cfi_def_cfa_offset 8
	ret
	.p2align 4,,10
	.p2align 3
.L14:
	.cfi_restore_state
	addl	$32, %edi
	movsbl	%dil, %edi
	call	putchar@PLT
	jmp	.L4
.L16:
	call	__stack_chk_fail@PLT
	.cfi_endproc
.LFE23:
	.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	"%[^\n]"
	.section	.text.startup,"ax",@progbits
	.p2align 4
	.globl	main
	.type	main, @function
main:
.LFB23:
	.cfi_startproc
	endbr64
	pushq	%rbx
	.cfi_def_cfa_offset 16
	.cfi_offset 3, -16
	leaq	.LC0(%rip), %rdi
	subq	$2016, %rsp
	.cfi_def_cfa_offset 2032
	movq	%fs:40, %rax
	movq	%rax, 2008(%rsp)
	xorl	%eax, %eax
	movq	%rsp, %rsi
	call	__isoc99_scanf@PLT
	movsbl	(%rsp), %edi
	testb	%dil, %dil
	je	.L2
	leaq	1(%rsp), %rbx
	jmp	.L6
	.p2align 4,,10
	.p2align 3
.L15:
	subl	$32, %edi
	movsbl	%dil, %edi
	call	putchar@PLT
.L4:
	movsbl	(%rbx), %edi
	addq	$1, %rbx
	testb	%dil, %dil
	je	.L2
.L6:
	leal	-65(%rdi), %eax
	cmpb	$25, %al
	jbe	.L14
	leal	-97(%rdi), %eax
	cmpb	$25, %al
	jbe	.L15
	call	putchar@PLT
	movsbl	(%rbx), %edi
	addq	$1, %rbx
	testb	%dil, %dil
	jne	.L6
.L2:
	movl	$10, %edi
	call	putchar@PLT
	movq	2008(%rsp), %rax
	subq	%fs:40, %rax
	jne	.L16
	addq	$2016, %rsp
	.cfi_remember_state
	.cfi_def_cfa_offset 16
	xorl	%eax, %eax
	popq	%rbx
	.cfi_def_cfa_offset 8
	ret
	.p2align 4,,10
	.p2align 3
.L14:
	.cfi_restore_state
	addl	$32, %edi
	movsbl	%dil, %edi
	call	putchar@PLT
	jmp	.L4
.L16:
	call	__stack_chk_fail@PLT
	.cfi_endproc
.LFE23:
	.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:
```