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 main ()
{
	char a [4] [4];
	int i, j;

	for (i = 0; i < 3; i ++) {
		for (j = 0; j < 3; j ++) scanf (" %c", &a [i] [j]);
	}

	printf ("%c%c%c", a [0] [0], a [1] [1], a [2] [2]);

	return 0;
}
```

Unoptimized Assembly Code:

```assembly
	.file	"temp.c"
	.text
	.section	.rodata
.LC0:
	.string	" %c"
.LC1:
	.string	"%c%c%c"
	.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
	subq	$48, %rsp
	movq	%fs:40, %rax
	movq	%rax, -8(%rbp)
	xorl	%eax, %eax
	movl	$0, -40(%rbp)
	jmp	.L2
.L5:
	movl	$0, -36(%rbp)
	jmp	.L3
.L4:
	leaq	-32(%rbp), %rdx
	movl	-36(%rbp), %eax
	movslq	%eax, %rcx
	movl	-40(%rbp), %eax
	cltq
	salq	$2, %rax
	addq	%rcx, %rax
	addq	%rdx, %rax
	movq	%rax, %rsi
	leaq	.LC0(%rip), %rax
	movq	%rax, %rdi
	movl	$0, %eax
	call	__isoc99_scanf@PLT
	addl	$1, -36(%rbp)
.L3:
	cmpl	$2, -36(%rbp)
	jle	.L4
	addl	$1, -40(%rbp)
.L2:
	cmpl	$2, -40(%rbp)
	jle	.L5
	movzbl	-22(%rbp), %eax
	movsbl	%al, %ecx
	movzbl	-27(%rbp), %eax
	movsbl	%al, %edx
	movzbl	-32(%rbp), %eax
	movsbl	%al, %eax
	movl	%eax, %esi
	leaq	.LC1(%rip), %rax
	movq	%rax, %rdi
	movl	$0, %eax
	call	printf@PLT
	movl	$0, %eax
	movq	-8(%rbp), %rdx
	subq	%fs:40, %rdx
	je	.L7
	call	__stack_chk_fail@PLT
.L7:
	leave
	.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	" %c"
.LC1:
	.string	"%c%c%c"
	.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
	pushq	%rbp
	.cfi_def_cfa_offset 24
	.cfi_offset 6, -24
	leaq	.LC0(%rip), %rbp
	pushq	%rbx
	.cfi_def_cfa_offset 32
	.cfi_offset 3, -32
	subq	$32, %rsp
	.cfi_def_cfa_offset 64
	movq	%fs:40, %rax
	movq	%rax, 24(%rsp)
	xorl	%eax, %eax
	movq	%rsp, %rbx
	leaq	12(%rsp), %r12
.L2:
	movq	%rbx, %rsi
	movq	%rbp, %rdi
	xorl	%eax, %eax
	call	__isoc99_scanf@PLT
	leaq	1(%rbx), %rsi
	movq	%rbp, %rdi
	xorl	%eax, %eax
	call	__isoc99_scanf@PLT
	leaq	2(%rbx), %rsi
	movq	%rbp, %rdi
	xorl	%eax, %eax
	call	__isoc99_scanf@PLT
	addq	$4, %rbx
	cmpq	%rbx, %r12
	jne	.L2
	movsbl	5(%rsp), %ecx
	movsbl	(%rsp), %edx
	xorl	%eax, %eax
	movl	$1, %edi
	movsbl	10(%rsp), %r8d
	leaq	.LC1(%rip), %rsi
	call	__printf_chk@PLT
	movq	24(%rsp), %rax
	subq	%fs:40, %rax
	jne	.L7
	addq	$32, %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
.L7:
	.cfi_restore_state
	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
	.file	"temp.c"
	.text
	.section	.rodata.str1.1,"aMS",@progbits,1
.LC0:
	.string	" %c"
.LC1:
	.string	"%c%c%c"
	.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
	pushq	%rbp
	.cfi_def_cfa_offset 24
	.cfi_offset 6, -24
	leaq	.LC0(%rip), %rbp
	pushq	%rbx
	.cfi_def_cfa_offset 32
	.cfi_offset 3, -32
	subq	$32, %rsp
	.cfi_def_cfa_offset 64
	movq	%fs:40, %rax
	movq	%rax, 24(%rsp)
	xorl	%eax, %eax
	movq	%rsp, %rbx
	leaq	12(%rsp), %r12
.L2:
	movq	%rbx, %rsi
	movq	%rbp, %rdi
	xorl	%eax, %eax
	call	__isoc99_scanf@PLT
	leaq	1(%rbx), %rsi
	movq	%rbp, %rdi
	xorl	%eax, %eax
	call	__isoc99_scanf@PLT
	leaq	2(%rbx), %rsi
	movq	%rbp, %rdi
	xorl	%eax, %eax
	call	__isoc99_scanf@PLT
	addq	$4, %rbx
	cmpq	%rbx, %r12
	jne	.L2
	movsbl	5(%rsp), %ecx
	movsbl	(%rsp), %edx
	xorl	%eax, %eax
	movl	$1, %edi
	movsbl	10(%rsp), %r8d
	leaq	.LC1(%rip), %rsi
	call	__printf_chk@PLT
	movq	24(%rsp), %rax
	subq	%fs:40, %rax
	jne	.L7
	addq	$32, %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
.L7:
	.cfi_restore_state
	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:

#include <stdio.h>

int main ()
{
	char a [4] [4];
	int i, j;

	for (i = 0; i < 3; i ++) {
		for (j = 0; j < 3; j ++) scanf (" %c", &a [i] [j]);
	}

	printf ("%c%c%c", a [0] [0], a [1] [1], a [2] [2]);

	return 0;
}

ant
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rfc
 ddu
cat
ion
 ant
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rcf
 ddu
cat
ioo
 ddu
cat
ooi
 una
obe
rcf
 edu
bau
ooi
 una
pbe
fdr
 una
bep
dfr
 ued
bau
oni

abc dan abf dao dai ubf eai ubr uer uai
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 main ()
{
	char a [4] [4];
	int i, j;

	for (i = 0; i < 3; i ++) {
		for (j = 0; j < 3; j ++) scanf (" %c", &a [i] [j]);
	}

	printf ("%c%c%c", a [0] [0], a [1] [1], a [2] [2]);

	return 0;
}
```

Unoptimized Assembly Code:

```assembly
	.file	"temp.c"
	.text
	.section	.rodata
.LC0:
	.string	" %c"
.LC1:
	.string	"%c%c%c"
	.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
	subq	$48, %rsp
	movq	%fs:40, %rax
	movq	%rax, -8(%rbp)
	xorl	%eax, %eax
	movl	$0, -40(%rbp)
	jmp	.L2
.L5:
	movl	$0, -36(%rbp)
	jmp	.L3
.L4:
	leaq	-32(%rbp), %rdx
	movl	-36(%rbp), %eax
	movslq	%eax, %rcx
	movl	-40(%rbp), %eax
	cltq
	salq	$2, %rax
	addq	%rcx, %rax
	addq	%rdx, %rax
	movq	%rax, %rsi
	leaq	.LC0(%rip), %rax
	movq	%rax, %rdi
	movl	$0, %eax
	call	__isoc99_scanf@PLT
	addl	$1, -36(%rbp)
.L3:
	cmpl	$2, -36(%rbp)
	jle	.L4
	addl	$1, -40(%rbp)
.L2:
	cmpl	$2, -40(%rbp)
	jle	.L5
	movzbl	-22(%rbp), %eax
	movsbl	%al, %ecx
	movzbl	-27(%rbp), %eax
	movsbl	%al, %edx
	movzbl	-32(%rbp), %eax
	movsbl	%al, %eax
	movl	%eax, %esi
	leaq	.LC1(%rip), %rax
	movq	%rax, %rdi
	movl	$0, %eax
	call	printf@PLT
	movl	$0, %eax
	movq	-8(%rbp), %rdx
	subq	%fs:40, %rdx
	je	.L7
	call	__stack_chk_fail@PLT
.L7:
	leave
	.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
	.section	.rodata
.LC0:
	.string	" %c"
.LC1:
	.string	"%c%c%c"
	.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
	subq	$48, %rsp
	movq	%fs:40, %rax
	movq	%rax, -8(%rbp)
	xorl	%eax, %eax
	movl	$0, -40(%rbp)
	jmp	.L2
.L5:
	movl	$0, -36(%rbp)
	jmp	.L3
.L4:
	leaq	-32(%rbp), %rdx
	movl	-36(%rbp), %eax
	movslq	%eax, %rcx
	movl	-40(%rbp), %eax
	cltq
	salq	$2, %rax
	addq	%rcx, %rax
	addq	%rdx, %rax
	movq	%rax, %rsi
	leaq	.LC0(%rip), %rax
	movq	%rax, %rdi
	movl	$0, %eax
	call	__isoc99_scanf@PLT
	addl	$1, -36(%rbp)
.L3:
	cmpl	$2, -36(%rbp)
	jle	.L4
	addl	$1, -40(%rbp)
.L2:
	cmpl	$2, -40(%rbp)
	jle	.L5
	movzbl	-22(%rbp), %eax
	movsbl	%al, %ecx
	movzbl	-27(%rbp), %eax
	movsbl	%al, %edx
	movzbl	-32(%rbp), %eax
	movsbl	%al, %eax
	movl	%eax, %esi
	leaq	.LC1(%rip), %rax
	movq	%rax, %rdi
	movl	$0, %eax
	call	printf@PLT
	movl	$0, %eax
	movq	-8(%rbp), %rdx
	subq	%fs:40, %rdx
	je	.L7
	call	__stack_chk_fail@PLT
.L7:
	leave
	.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:
