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

```c
/*
 * ID: ITP1_8_A
 * Problem: Toggling the case of strings
 */

#include <stdio.h>

int main(void)
{
    char s[1200];

    fgets(s, sizeof(s) - 1, stdin);

    int i;
    for (i = 0; i < 1200 && s[i] != '\0'; i++)
        if (islower(s[i]))
            printf("%c", toupper(s[i]));
        else if (isupper(s[i]))
            printf("%c", tolower(s[i]));
        else
            printf("%c", s[i]);

    return 0;
}


```

Assembly Code:

```assembly
	.file	"temp.c"
	.text
	.section	.text.startup,"ax",@progbits
	.p2align 4
	.globl	main
	.type	main, @function
main:
.LFB23:
	.cfi_startproc
	endbr64
	pushq	%r12
	.cfi_def_cfa_offset 16
	.cfi_offset 12, -16
	movl	$1199, %esi
	pushq	%rbp
	.cfi_def_cfa_offset 24
	.cfi_offset 6, -24
	pushq	%rbx
	.cfi_def_cfa_offset 32
	.cfi_offset 3, -32
	subq	$1216, %rsp
	.cfi_def_cfa_offset 1248
	movq	stdin(%rip), %rdx
	movq	%fs:40, %rax
	movq	%rax, 1208(%rsp)
	xorl	%eax, %eax
	movq	%rsp, %rbx
	leaq	1200(%rsp), %r12
	movq	%rbx, %rdi
	call	fgets@PLT
	jmp	.L2
	.p2align 4,,10
	.p2align 3
.L14:
	call	tolower@PLT
	movl	%eax, %edi
	call	putchar@PLT
.L4:
	addq	$1, %rbx
	cmpq	%r12, %rbx
	je	.L7
.L2:
	movsbl	(%rbx), %ebp
	testb	%bpl, %bpl
	je	.L7
	movl	%ebp, %edi
	call	islower@PLT
	movl	%ebp, %edi
	testl	%eax, %eax
	jne	.L13
	call	isupper@PLT
	movl	%ebp, %edi
	testl	%eax, %eax
	jne	.L14
	call	putchar@PLT
	addq	$1, %rbx
	cmpq	%r12, %rbx
	jne	.L2
	.p2align 4,,10
	.p2align 3
.L7:
	movq	1208(%rsp), %rax
	subq	%fs:40, %rax
	jne	.L15
	addq	$1216, %rsp
	.cfi_remember_state
	.cfi_def_cfa_offset 32
	xorl	%eax, %eax
	popq	%rbx
	.cfi_def_cfa_offset 24
	popq	%rbp
	.cfi_def_cfa_offset 16
	popq	%r12
	.cfi_def_cfa_offset 8
	ret
	.p2align 4,,10
	.p2align 3
.L13:
	.cfi_restore_state
	call	toupper@PLT
	movl	%eax, %edi
	call	putchar@PLT
	jmp	.L4
.L15:
	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	.text.startup,"ax",@progbits
	.p2align 4
	.globl	main
	.type	main, @function
main:
.LFB23:
	.cfi_startproc
	endbr64
	pushq	%r12
	.cfi_def_cfa_offset 16
	.cfi_offset 12, -16
	movl	$1199, %esi
	pushq	%rbp
	.cfi_def_cfa_offset 24
	.cfi_offset 6, -24
	pushq	%rbx
	.cfi_def_cfa_offset 32
	.cfi_offset 3, -32
	subq	$1216, %rsp
	.cfi_def_cfa_offset 1248
	movq	stdin(%rip), %rdx
	movq	%fs:40, %rax
	movq	%rax, 1208(%rsp)
	xorl	%eax, %eax
	movq	%rsp, %rbx
	leaq	1200(%rsp), %r12
	movq	%rbx, %rdi
	call	fgets@PLT
	jmp	.L2
	.p2align 4,,10
	.p2align 3
.L14:
	call	tolower@PLT
	movl	%eax, %edi
	call	putchar@PLT
.L4:
	addq	$1, %rbx
	cmpq	%r12, %rbx
	je	.L7
.L2:
	movsbl	(%rbx), %ebp
	testb	%bpl, %bpl
	je	.L7
	movl	%ebp, %edi
	call	islower@PLT
	movl	%ebp, %edi
	testl	%eax, %eax
	jne	.L13
	call	isupper@PLT
	movl	%ebp, %edi
	testl	%eax, %eax
	jne	.L14
	call	putchar@PLT
	addq	$1, %rbx
	cmpq	%r12, %rbx
	jne	.L2
	.p2align 4,,10
	.p2align 3
.L7:
	movq	1208(%rsp), %rax
	subq	%fs:40, %rax
	jne	.L15
	addq	$1216, %rsp
	.cfi_remember_state
	.cfi_def_cfa_offset 32
	xorl	%eax, %eax
	popq	%rbx
	.cfi_def_cfa_offset 24
	popq	%rbp
	.cfi_def_cfa_offset 16
	popq	%r12
	.cfi_def_cfa_offset 8
	ret
	.p2align 4,,10
	.p2align 3
.L13:
	.cfi_restore_state
	call	toupper@PLT
	movl	%eax, %edi
	call	putchar@PLT
	jmp	.L4
.L15:
	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	.text.startup,"ax",@progbits
	.p2align 4
	.globl	main
	.type	main, @function
main:
.LFB23:
	.cfi_startproc
	endbr64
	pushq	%r12
	.cfi_def_cfa_offset 16
	.cfi_offset 12, -16
	movl	$1199, %esi
	pushq	%rbp
	.cfi_def_cfa_offset 24
	.cfi_offset 6, -24
	pushq	%rbx
	.cfi_def_cfa_offset 32
	.cfi_offset 3, -32
	subq	$1216, %rsp
	.cfi_def_cfa_offset 1248
	movq	stdin(%rip), %rdx
	movq	%fs:40, %rax
	movq	%rax, 1208(%rsp)
	xorl	%eax, %eax
	movq	%rsp, %rbx
	leaq	1200(%rsp), %r12
	movq	%rbx, %rdi
	call	fgets@PLT
	jmp	.L2
	.p2align 4,,10
	.p2align 3
.L14:
	call	tolower@PLT
	movl	%eax, %edi
	call	putchar@PLT
.L4:
	addq	$1, %rbx
	cmpq	%r12, %rbx
	je	.L7
.L2:
	movsbl	(%rbx), %ebp
	testb	%bpl, %bpl
	je	.L7
	movl	%ebp, %edi
	call	islower@PLT
	movl	%ebp, %edi
	testl	%eax, %eax
	jne	.L13
	call	isupper@PLT
	movl	%ebp, %edi
	testl	%eax, %eax
	jne	.L14
	call	putchar@PLT
	addq	$1, %rbx
	cmpq	%r12, %rbx
	jne	.L2
	.p2align 4,,10
	.p2align 3
.L7:
	movq	1208(%rsp), %rax
	subq	%fs:40, %rax
	jne	.L15
	addq	$1216, %rsp
	.cfi_remember_state
	.cfi_def_cfa_offset 32
	xorl	%eax, %eax
	popq	%rbx
	.cfi_def_cfa_offset 24
	popq	%rbp
	.cfi_def_cfa_offset 16
	popq	%r12
	.cfi_def_cfa_offset 8
	ret
	.p2align 4,,10
	.p2align 3
.L13:
	.cfi_restore_state
	call	toupper@PLT
	movl	%eax, %edi
	call	putchar@PLT
	jmp	.L4
.L15:
	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
/*
 * ID: ITP1_8_A
 * Problem: Toggling the case of strings
 */

#include <stdio.h>

int main(void)
{
    char s[1200];

    fgets(s, sizeof(s) - 1, stdin);

    int i;
    for (i = 0; i < 1200 && s[i] != '\0'; i++)
        if (islower(s[i]))
            printf("%c", toupper(s[i]));
        else if (isupper(s[i]))
            printf("%c", tolower(s[i]));
        else
            printf("%c", s[i]);

    return 0;
}


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

```c
/*
 * ID: ITP1_8_A
 * Problem: Toggling the case of strings
 */

#include <stdio.h>

int main(void)
{
    char s[1200];

    fgets(s, sizeof(s) - 1, stdin);

    int i;
    for (i = 0; i < 1200 && s[i] != '\0'; i++)
        if (islower(s[i]))
            printf("%c", toupper(s[i]));
        else if (isupper(s[i]))
            printf("%c", tolower(s[i]));
        else
            printf("%c", s[i]);

    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
/*
 * ID: ITP1_8_A
 * Problem: Toggling the case of strings
 */

#include <stdio.h>

int main(void)
{
    char s[1200];

    fgets(s, sizeof(s) - 1, stdin);

    int i;
    for (i = 0; i < 1200 && s[i] != '\0'; i++)
        if (islower(s[i]))
            printf("%c", toupper(s[i]));
        else if (isupper(s[i]))
            printf("%c", tolower(s[i]));
        else
            printf("%c", s[i]);

    return 0;
}


```

Assembly Code:

```assembly
	.file	"temp.c"
	.text
	.section	.text.startup,"ax",@progbits
	.p2align 4
	.globl	main
	.type	main, @function
main:
.LFB23:
	.cfi_startproc
	endbr64
	pushq	%r12
	.cfi_def_cfa_offset 16
	.cfi_offset 12, -16
	movl	$1199, %esi
	pushq	%rbp
	.cfi_def_cfa_offset 24
	.cfi_offset 6, -24
	pushq	%rbx
	.cfi_def_cfa_offset 32
	.cfi_offset 3, -32
	subq	$1216, %rsp
	.cfi_def_cfa_offset 1248
	movq	stdin(%rip), %rdx
	movq	%fs:40, %rax
	movq	%rax, 1208(%rsp)
	xorl	%eax, %eax
	movq	%rsp, %rbx
	leaq	1200(%rsp), %r12
	movq	%rbx, %rdi
	call	fgets@PLT
	jmp	.L2
	.p2align 4,,10
	.p2align 3
.L14:
	call	tolower@PLT
	movl	%eax, %edi
	call	putchar@PLT
.L4:
	addq	$1, %rbx
	cmpq	%r12, %rbx
	je	.L7
.L2:
	movsbl	(%rbx), %ebp
	testb	%bpl, %bpl
	je	.L7
	movl	%ebp, %edi
	call	islower@PLT
	movl	%ebp, %edi
	testl	%eax, %eax
	jne	.L13
	call	isupper@PLT
	movl	%ebp, %edi
	testl	%eax, %eax
	jne	.L14
	call	putchar@PLT
	addq	$1, %rbx
	cmpq	%r12, %rbx
	jne	.L2
	.p2align 4,,10
	.p2align 3
.L7:
	movq	1208(%rsp), %rax
	subq	%fs:40, %rax
	jne	.L15
	addq	$1216, %rsp
	.cfi_remember_state
	.cfi_def_cfa_offset 32
	xorl	%eax, %eax
	popq	%rbx
	.cfi_def_cfa_offset 24
	popq	%rbp
	.cfi_def_cfa_offset 16
	popq	%r12
	.cfi_def_cfa_offset 8
	ret
	.p2align 4,,10
	.p2align 3
.L13:
	.cfi_restore_state
	call	toupper@PLT
	movl	%eax, %edi
	call	putchar@PLT
	jmp	.L4
.L15:
	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	.text.startup,"ax",@progbits
	.p2align 4
	.globl	main
	.type	main, @function
main:
.LFB23:
	.cfi_startproc
	endbr64
	pushq	%r12
	.cfi_def_cfa_offset 16
	.cfi_offset 12, -16
	movl	$1199, %esi
	pushq	%rbp
	.cfi_def_cfa_offset 24
	.cfi_offset 6, -24
	pushq	%rbx
	.cfi_def_cfa_offset 32
	.cfi_offset 3, -32
	subq	$1216, %rsp
	.cfi_def_cfa_offset 1248
	movq	stdin(%rip), %rdx
	movq	%fs:40, %rax
	movq	%rax, 1208(%rsp)
	xorl	%eax, %eax
	movq	%rsp, %rbx
	leaq	1200(%rsp), %r12
	movq	%rbx, %rdi
	call	fgets@PLT
	jmp	.L2
	.p2align 4,,10
	.p2align 3
.L14:
	call	tolower@PLT
	movl	%eax, %edi
	call	putchar@PLT
.L4:
	addq	$1, %rbx
	cmpq	%r12, %rbx
	je	.L7
.L2:
	movsbl	(%rbx), %ebp
	testb	%bpl, %bpl
	je	.L7
	movl	%ebp, %edi
	call	islower@PLT
	movl	%ebp, %edi
	testl	%eax, %eax
	jne	.L13
	call	isupper@PLT
	movl	%ebp, %edi
	testl	%eax, %eax
	jne	.L14
	call	putchar@PLT
	addq	$1, %rbx
	cmpq	%r12, %rbx
	jne	.L2
	.p2align 4,,10
	.p2align 3
.L7:
	movq	1208(%rsp), %rax
	subq	%fs:40, %rax
	jne	.L15
	addq	$1216, %rsp
	.cfi_remember_state
	.cfi_def_cfa_offset 32
	xorl	%eax, %eax
	popq	%rbx
	.cfi_def_cfa_offset 24
	popq	%rbp
	.cfi_def_cfa_offset 16
	popq	%r12
	.cfi_def_cfa_offset 8
	ret
	.p2align 4,,10
	.p2align 3
.L13:
	.cfi_restore_state
	call	toupper@PLT
	movl	%eax, %edi
	call	putchar@PLT
	jmp	.L4
.L15:
	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:
```