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

```c
// AOJ 2407: Simple Othello
// 2017.11.28 bal4u@uu

#include <stdio.h>
#include <string.h>

char buf[55];

int main()
{
	scanf("%s", buf);
	puts(*buf == 'x' && *(buf+strlen(buf)-1) == 'x' ? "x" : "o");
	return 0;
}```

Unoptimized Assembly Code:

```assembly
	.file	"temp.c"
	.text
	.globl	buf
	.bss
	.align 32
	.type	buf, @object
	.size	buf, 55
buf:
	.zero	55
	.section	.rodata
.LC0:
	.string	"%s"
.LC1:
	.string	"x"
.LC2:
	.string	"o"
	.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	buf(%rip), %rax
	movq	%rax, %rsi
	leaq	.LC0(%rip), %rax
	movq	%rax, %rdi
	movl	$0, %eax
	call	__isoc99_scanf@PLT
	movzbl	buf(%rip), %eax
	cmpb	$120, %al
	jne	.L2
	leaq	buf(%rip), %rax
	movq	%rax, %rdi
	call	strlen@PLT
	leaq	-1(%rax), %rdx
	leaq	buf(%rip), %rax
	addq	%rdx, %rax
	movzbl	(%rax), %eax
	cmpb	$120, %al
	jne	.L2
	leaq	.LC1(%rip), %rax
	jmp	.L3
.L2:
	leaq	.LC2(%rip), %rax
.L3:
	movq	%rax, %rdi
	call	puts@PLT
	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	"x"
.LC1:
	.string	"o"
.LC2:
	.string	"%s"
	.section	.text.startup,"ax",@progbits
	.p2align 4
	.globl	main
	.type	main, @function
main:
.LFB35:
	.cfi_startproc
	endbr64
	pushq	%r12
	.cfi_def_cfa_offset 16
	.cfi_offset 12, -16
	leaq	buf(%rip), %r12
	xorl	%eax, %eax
	leaq	.LC2(%rip), %rdi
	pushq	%rbp
	.cfi_def_cfa_offset 24
	.cfi_offset 6, -24
	movq	%r12, %rsi
	leaq	.LC1(%rip), %rbp
	subq	$8, %rsp
	.cfi_def_cfa_offset 32
	call	__isoc99_scanf@PLT
	cmpb	$120, buf(%rip)
	jne	.L2
	movq	%r12, %rdi
	call	strlen@PLT
	cmpb	$120, -1(%rax,%r12)
	leaq	.LC0(%rip), %rax
	cmove	%rax, %rbp
.L2:
	movq	%rbp, %rdi
	call	puts@PLT
	addq	$8, %rsp
	.cfi_def_cfa_offset 24
	xorl	%eax, %eax
	popq	%rbp
	.cfi_def_cfa_offset 16
	popq	%r12
	.cfi_def_cfa_offset 8
	ret
	.cfi_endproc
.LFE35:
	.size	main, .-main
	.globl	buf
	.bss
	.align 32
	.type	buf, @object
	.size	buf, 55
buf:
	.zero	55
	.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	"x"
.LC1:
	.string	"o"
.LC2:
	.string	"%s"
	.section	.text.startup,"ax",@progbits
	.p2align 4
	.globl	main
	.type	main, @function
main:
.LFB35:
	.cfi_startproc
	endbr64
	pushq	%r12
	.cfi_def_cfa_offset 16
	.cfi_offset 12, -16
	leaq	buf(%rip), %r12
	xorl	%eax, %eax
	leaq	.LC2(%rip), %rdi
	pushq	%rbp
	.cfi_def_cfa_offset 24
	.cfi_offset 6, -24
	movq	%r12, %rsi
	leaq	.LC1(%rip), %rbp
	subq	$8, %rsp
	.cfi_def_cfa_offset 32
	call	__isoc99_scanf@PLT
	cmpb	$120, buf(%rip)
	jne	.L2
	movq	%r12, %rdi
	call	strlen@PLT
	cmpb	$120, -1(%rax,%r12)
	leaq	.LC0(%rip), %rax
	cmove	%rax, %rbp
.L2:
	movq	%rbp, %rdi
	call	puts@PLT
	addq	$8, %rsp
	.cfi_def_cfa_offset 24
	xorl	%eax, %eax
	popq	%rbp
	.cfi_def_cfa_offset 16
	popq	%r12
	.cfi_def_cfa_offset 8
	ret
	.cfi_endproc
.LFE35:
	.size	main, .-main
	.globl	buf
	.bss
	.align 32
	.type	buf, @object
	.size	buf, 55
buf:
	.zero	55
	.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:

// AOJ 2407: Simple Othello
// 2017.11.28 bal4u@uu

#include <stdio.h>
#include <string.h>

char buf[55];

int main()
{
	scanf("%s", buf);
	puts(*buf == 'x' && *(buf+strlen(buf)-1) == 'x' ? "x" : "o");
	return 0;
}
oxxoxoo

o

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

```c
// AOJ 2407: Simple Othello
// 2017.11.28 bal4u@uu

#include <stdio.h>
#include <string.h>

char buf[55];

int main()
{
	scanf("%s", buf);
	puts(*buf == 'x' && *(buf+strlen(buf)-1) == 'x' ? "x" : "o");
	return 0;
}```

Unoptimized Assembly Code:

```assembly
	.file	"temp.c"
	.text
	.globl	buf
	.bss
	.align 32
	.type	buf, @object
	.size	buf, 55
buf:
	.zero	55
	.section	.rodata
.LC0:
	.string	"%s"
.LC1:
	.string	"x"
.LC2:
	.string	"o"
	.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	buf(%rip), %rax
	movq	%rax, %rsi
	leaq	.LC0(%rip), %rax
	movq	%rax, %rdi
	movl	$0, %eax
	call	__isoc99_scanf@PLT
	movzbl	buf(%rip), %eax
	cmpb	$120, %al
	jne	.L2
	leaq	buf(%rip), %rax
	movq	%rax, %rdi
	call	strlen@PLT
	leaq	-1(%rax), %rdx
	leaq	buf(%rip), %rax
	addq	%rdx, %rax
	movzbl	(%rax), %eax
	cmpb	$120, %al
	jne	.L2
	leaq	.LC1(%rip), %rax
	jmp	.L3
.L2:
	leaq	.LC2(%rip), %rax
.L3:
	movq	%rax, %rdi
	call	puts@PLT
	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	buf
	.bss
	.align 32
	.type	buf, @object
	.size	buf, 55
buf:
	.zero	55
	.section	.rodata
.LC0:
	.string	"%s"
.LC1:
	.string	"x"
.LC2:
	.string	"o"
	.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	buf(%rip), %rax
	movq	%rax, %rsi
	leaq	.LC0(%rip), %rax
	movq	%rax, %rdi
	movl	$0, %eax
	call	__isoc99_scanf@PLT
	movzbl	buf(%rip), %eax
	cmpb	$120, %al
	jne	.L2
	leaq	buf(%rip), %rax
	movq	%rax, %rdi
	call	strlen@PLT
	leaq	-1(%rax), %rdx
	leaq	buf(%rip), %rax
	addq	%rdx, %rax
	movzbl	(%rax), %eax
	cmpb	$120, %al
	jne	.L2
	leaq	.LC1(%rip), %rax
	jmp	.L3
.L2:
	leaq	.LC2(%rip), %rax
.L3:
	movq	%rax, %rdi
	call	puts@PLT
	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:
