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

```c
#include<stdio.h>
int a, b, c;
long k;
int main(void){
  scanf("%d%d%d%ld", &a, &b, &c, &k);
  if(k&1){
    printf("%d\n", b-a);
  }else{
    printf("%d\n", a-b);
  }
}
```

Unoptimized Assembly Code:

```assembly
	.file	"temp.c"
	.text
	.globl	a
	.bss
	.align 4
	.type	a, @object
	.size	a, 4
a:
	.zero	4
	.globl	b
	.align 4
	.type	b, @object
	.size	b, 4
b:
	.zero	4
	.globl	c
	.align 4
	.type	c, @object
	.size	c, 4
c:
	.zero	4
	.globl	k
	.align 8
	.type	k, @object
	.size	k, 8
k:
	.zero	8
	.section	.rodata
.LC0:
	.string	"%d%d%d%ld"
.LC1:
	.string	"%d\n"
	.text
	.globl	main
	.type	main, @function
main:
.LFB0:
	.cfi_startproc
	endbr64
	pushq	%rbp
	.cfi_def_cfa_offset 16
	.cfi_offset 6, -16
	movq	%rsp, %rbp
	.cfi_def_cfa_register 6
	leaq	k(%rip), %r8
	leaq	c(%rip), %rax
	movq	%rax, %rcx
	leaq	b(%rip), %rax
	movq	%rax, %rdx
	leaq	a(%rip), %rax
	movq	%rax, %rsi
	leaq	.LC0(%rip), %rax
	movq	%rax, %rdi
	movl	$0, %eax
	call	__isoc99_scanf@PLT
	movq	k(%rip), %rax
	andl	$1, %eax
	testq	%rax, %rax
	je	.L2
	movl	b(%rip), %eax
	movl	a(%rip), %edx
	subl	%edx, %eax
	movl	%eax, %esi
	leaq	.LC1(%rip), %rax
	movq	%rax, %rdi
	movl	$0, %eax
	call	printf@PLT
	jmp	.L3
.L2:
	movl	a(%rip), %eax
	movl	b(%rip), %edx
	subl	%edx, %eax
	movl	%eax, %esi
	leaq	.LC1(%rip), %rax
	movq	%rax, %rdi
	movl	$0, %eax
	call	printf@PLT
.L3:
	movl	$0, %eax
	popq	%rbp
	.cfi_def_cfa 7, 8
	ret
	.cfi_endproc
.LFE0:
	.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.
user
	.file	"temp.c"
	.text
	.section	.rodata.str1.1,"aMS",@progbits,1
.LC0:
	.string	"%d%d%d%ld"
.LC1:
	.string	"%d\n"
	.section	.text.startup,"ax",@progbits
	.p2align 4
	.globl	main
	.type	main, @function
main:
.LFB23:
	.cfi_startproc
	endbr64
	subq	$8, %rsp
	.cfi_def_cfa_offset 16
	xorl	%eax, %eax
	leaq	k(%rip), %r8
	leaq	c(%rip), %rcx
	leaq	b(%rip), %rdx
	leaq	a(%rip), %rsi
	leaq	.LC0(%rip), %rdi
	call	__isoc99_scanf@PLT
	testb	$1, k(%rip)
	je	.L2
	movl	b(%rip), %edx
	leaq	.LC1(%rip), %rsi
	movl	$1, %edi
	xorl	%eax, %eax
	subl	a(%rip), %edx
	call	__printf_chk@PLT
.L3:
	xorl	%eax, %eax
	addq	$8, %rsp
	.cfi_remember_state
	.cfi_def_cfa_offset 8
	ret
.L2:
	.cfi_restore_state
	movl	a(%rip), %edx
	leaq	.LC1(%rip), %rsi
	movl	$1, %edi
	xorl	%eax, %eax
	subl	b(%rip), %edx
	call	__printf_chk@PLT
	jmp	.L3
	.cfi_endproc
.LFE23:
	.size	main, .-main
	.globl	k
	.bss
	.align 8
	.type	k, @object
	.size	k, 8
k:
	.zero	8
	.globl	c
	.align 4
	.type	c, @object
	.size	c, 4
c:
	.zero	4
	.globl	b
	.align 4
	.type	b, @object
	.size	b, 4
b:
	.zero	4
	.globl	a
	.align 4
	.type	a, @object
	.size	a, 4
a:
	.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
	.file	"temp.c"
	.text
	.section	.rodata.str1.1,"aMS",@progbits,1
.LC0:
	.string	"%d%d%d%ld"
.LC1:
	.string	"%d\n"
	.section	.text.startup,"ax",@progbits
	.p2align 4
	.globl	main
	.type	main, @function
main:
.LFB23:
	.cfi_startproc
	endbr64
	subq	$8, %rsp
	.cfi_def_cfa_offset 16
	xorl	%eax, %eax
	leaq	k(%rip), %r8
	leaq	c(%rip), %rcx
	leaq	b(%rip), %rdx
	leaq	a(%rip), %rsi
	leaq	.LC0(%rip), %rdi
	call	__isoc99_scanf@PLT
	testb	$1, k(%rip)
	je	.L2
	movl	b(%rip), %edx
	leaq	.LC1(%rip), %rsi
	movl	$1, %edi
	xorl	%eax, %eax
	subl	a(%rip), %edx
	call	__printf_chk@PLT
.L3:
	xorl	%eax, %eax
	addq	$8, %rsp
	.cfi_remember_state
	.cfi_def_cfa_offset 8
	ret
.L2:
	.cfi_restore_state
	movl	a(%rip), %edx
	leaq	.LC1(%rip), %rsi
	movl	$1, %edi
	xorl	%eax, %eax
	subl	b(%rip), %edx
	call	__printf_chk@PLT
	jmp	.L3
	.cfi_endproc
.LFE23:
	.size	main, .-main
	.globl	k
	.bss
	.align 8
	.type	k, @object
	.size	k, 8
k:
	.zero	8
	.globl	c
	.align 4
	.type	c, @object
	.size	c, 4
c:
	.zero	4
	.globl	b
	.align 4
	.type	b, @object
	.size	b, 4
b:
	.zero	4
	.globl	a
	.align 4
	.type	a, @object
	.size	a, 4
a:
	.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:

#include<stdio.h>
int a, b, c;
long k;
int main(void){
  scanf("%d%d%d%ld", &a, &b, &c, &k);
  if(k&1){
    printf("%d\n", b-a);
  }else{
    printf("%d\n", a-b);
  }
}

2 2 3 1
 0 3 2 0
 1000000000 1000000010 1000000000 1000000000000000000
 2 3 3 1
 4 3 3 1
 0 3 2 -1
 -1 3 4 -1
 1000000000 0000000010 1000000010 1000010100000000000
 -2 3 8 -1
 1000010000 0000000010 1100000010 1000010100000000000

0
 -3
 -10
 1
 -1
 3
 4
 999999990
 5
 1000009990

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

```c
#include<stdio.h>
int a, b, c;
long k;
int main(void){
  scanf("%d%d%d%ld", &a, &b, &c, &k);
  if(k&1){
    printf("%d\n", b-a);
  }else{
    printf("%d\n", a-b);
  }
}
```

Unoptimized Assembly Code:

```assembly
	.file	"temp.c"
	.text
	.globl	a
	.bss
	.align 4
	.type	a, @object
	.size	a, 4
a:
	.zero	4
	.globl	b
	.align 4
	.type	b, @object
	.size	b, 4
b:
	.zero	4
	.globl	c
	.align 4
	.type	c, @object
	.size	c, 4
c:
	.zero	4
	.globl	k
	.align 8
	.type	k, @object
	.size	k, 8
k:
	.zero	8
	.section	.rodata
.LC0:
	.string	"%d%d%d%ld"
.LC1:
	.string	"%d\n"
	.text
	.globl	main
	.type	main, @function
main:
.LFB0:
	.cfi_startproc
	endbr64
	pushq	%rbp
	.cfi_def_cfa_offset 16
	.cfi_offset 6, -16
	movq	%rsp, %rbp
	.cfi_def_cfa_register 6
	leaq	k(%rip), %r8
	leaq	c(%rip), %rax
	movq	%rax, %rcx
	leaq	b(%rip), %rax
	movq	%rax, %rdx
	leaq	a(%rip), %rax
	movq	%rax, %rsi
	leaq	.LC0(%rip), %rax
	movq	%rax, %rdi
	movl	$0, %eax
	call	__isoc99_scanf@PLT
	movq	k(%rip), %rax
	andl	$1, %eax
	testq	%rax, %rax
	je	.L2
	movl	b(%rip), %eax
	movl	a(%rip), %edx
	subl	%edx, %eax
	movl	%eax, %esi
	leaq	.LC1(%rip), %rax
	movq	%rax, %rdi
	movl	$0, %eax
	call	printf@PLT
	jmp	.L3
.L2:
	movl	a(%rip), %eax
	movl	b(%rip), %edx
	subl	%edx, %eax
	movl	%eax, %esi
	leaq	.LC1(%rip), %rax
	movq	%rax, %rdi
	movl	$0, %eax
	call	printf@PLT
.L3:
	movl	$0, %eax
	popq	%rbp
	.cfi_def_cfa 7, 8
	ret
	.cfi_endproc
.LFE0:
	.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.
train
	.file	"temp.c"
	.text
	.globl	a
	.bss
	.align 4
	.type	a, @object
	.size	a, 4
a:
	.zero	4
	.globl	b
	.align 4
	.type	b, @object
	.size	b, 4
b:
	.zero	4
	.globl	c
	.align 4
	.type	c, @object
	.size	c, 4
c:
	.zero	4
	.globl	k
	.align 8
	.type	k, @object
	.size	k, 8
k:
	.zero	8
	.section	.rodata
.LC0:
	.string	"%d%d%d%ld"
.LC1:
	.string	"%d\n"
	.text
	.globl	main
	.type	main, @function
main:
.LFB0:
	.cfi_startproc
	endbr64
	pushq	%rbp
	.cfi_def_cfa_offset 16
	.cfi_offset 6, -16
	movq	%rsp, %rbp
	.cfi_def_cfa_register 6
	leaq	k(%rip), %r8
	leaq	c(%rip), %rax
	movq	%rax, %rcx
	leaq	b(%rip), %rax
	movq	%rax, %rdx
	leaq	a(%rip), %rax
	movq	%rax, %rsi
	leaq	.LC0(%rip), %rax
	movq	%rax, %rdi
	movl	$0, %eax
	call	__isoc99_scanf@PLT
	movq	k(%rip), %rax
	andl	$1, %eax
	testq	%rax, %rax
	je	.L2
	movl	b(%rip), %eax
	movl	a(%rip), %edx
	subl	%edx, %eax
	movl	%eax, %esi
	leaq	.LC1(%rip), %rax
	movq	%rax, %rdi
	movl	$0, %eax
	call	printf@PLT
	jmp	.L3
.L2:
	movl	a(%rip), %eax
	movl	b(%rip), %edx
	subl	%edx, %eax
	movl	%eax, %esi
	leaq	.LC1(%rip), %rax
	movq	%rax, %rdi
	movl	$0, %eax
	call	printf@PLT
.L3:
	movl	$0, %eax
	popq	%rbp
	.cfi_def_cfa 7, 8
	ret
	.cfi_endproc
.LFE0:
	.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:
