user: 请从给定的汇编指令推导出C源代码：

```asm
<main>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %r15
  push   %r14
  lea    -0x40(%rbp),%rsi
  push   %r13
  lea    -0x3c(%rbp),%r13
  push   %r12
  lea    D18(%rip),%r12
  push   %rbx
  mov    %r12,%rdi
  sub    $0x28,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,-0x38(%rbp)
  xor    %eax,%eax
  call   <scanf@plt>
  mov    -0x40(%rbp),%edx
  lea    D19(%rip),%rsi
  mov    %r13,%rdi
  call   <sprintf@plt>
  mov    %r13,%rdi
  call   <strlen@plt>
  movslq %eax,%r14
  test   %r14d,%r14d
  jle    L9
  lea    -0x1(%r14),%eax
  mov    %r13,%rbx
  mov    %eax,-0x44(%rbp)
  lea    -0x3b(%rbp,%rax,1),%r15
L201:
  movsbl (%rbx),%edi
  add    $0x1,%rbx
  call   <toupper@plt>
  mov    %al,-0x1(%rbx)
  cmp    %r15,%rbx
  jne    L201
  lea    0xf(%r14),%r15
  mov    %rsp,%rdx
  mov    %r15,%rcx
  mov    %r15,%rax
  and    $0xfffffffffffff000,%rcx
  and    $0xfffffffffffffff0,%rax
  sub    %rcx,%rdx
L209:
  cmp    %rdx,%rsp
  je     L173
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L209
L173:
  and    $0xfff,%eax
  sub    %rax,%rsp
  test   %rax,%rax
  jne    L28
L253:
  movslq -0x44(%rbp),%rax
  mov    %rsp,%rdi
  mov    %rsp,%rdx
  nopl   0x0(%rax)
L73:
  movzbl 0x0(%r13,%rax,1),%ecx
  sub    $0x1,%rax
  add    $0x1,%rdx
  mov    %cl,-0x1(%rdx)
  test   %eax,%eax
  jns    L73
L149:
  movb   $0x0,(%rdi,%r14,1)
  mov    %r13,%rsi
  call   <strcmp@plt>
  test   %rax,%rax
  je     L213
  mov    %r15,%rcx
  mov    %r15,%rax
  mov    %rsp,%rdx
  mov    %rsp,%r13
  and    $0xfffffffffffff000,%rcx
  and    $0xfffffffffffffff0,%rax
  sub    %rcx,%rdx
L200:
  cmp    %rdx,%rsp
  je     L79
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L200
L213:
  mov    %r13,%rsi
  lea    D26(%rip),%rdi
  xor    %eax,%eax
  call   <printf@plt>
L155:
  mov    -0x38(%rbp),%rax
  sub    %fs:0x28,%rax
  jne    L164
  lea    -0x28(%rbp),%rsp
  xor    %eax,%eax
  pop    %rbx
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  pop    %rbp
  ret
L9:
  movslq %r14d,%r15
  mov    %rsp,%rdx
  add    $0xf,%r15
  mov    %r15,%rcx
  mov    %r15,%rax
  and    $0xfffffffffffff000,%rcx
  and    $0xfffffffffffffff0,%rax
  sub    %rcx,%rdx
L25:
  cmp    %rdx,%rsp
  je     L176
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L25
L79:
  and    $0xfff,%eax
  sub    %rax,%rsp
  test   %rax,%rax
  jne    L45
L60:
  mov    %r15,%rax
  mov    %rsp,%rdx
  and    $0xfffffffffffff000,%r15
  mov    %rsp,%rbx
  and    $0xfffffffffffffff0,%rax
  sub    %r15,%rdx
L257:
  cmp    %rdx,%rsp
  je     L180
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L257
L28:
  orq    $0x0,-0x8(%rsp,%rax,1)
  jmp    L253
L45:
  orq    $0x0,-0x8(%rsp,%rax,1)
  jmp    L60
L180:
  and    $0xfff,%eax
  sub    %rax,%rsp
  test   %rax,%rax
  jne    L131
L127:
  mov    %rsp,%r14
  nopl   0x0(%rax)
L264:
  mov    -0x40(%rbp),%edx
  mov    %rbx,%rdi
  mov    %r12,%rsi
  call   <sprintf@plt>
  mov    %rbx,%rdi
  call   <strlen@plt>
  test   %eax,%eax
  jle    L93
  movslq %eax,%rdi
  sub    $0x1,%eax
  mov    %r14,%rdx
  lea    -0x1(%rbx,%rdi,1),%rcx
  lea    0x1(%r14,%rax,1),%rsi
  nopl   (%rax)
L185:
  movzbl (%rcx),%eax
  add    $0x1,%rdx
  sub    $0x1,%rcx
  mov    %al,-0x1(%rdx)
  cmp    %rsi,%rdx
  jne    L185
L232:
  movb   $0x0,(%r14,%rdi,1)
  mov    %r14,%rsi
  mov    %rbx,%rdi
  addl   $0x1,-0x40(%rbp)
  call   <strcmp@plt>
  test   %rax,%rax
  jne    L264
  mov    -0x40(%rbp),%eax
  lea    D30(%rip),%rdi
  lea    -0x1(%rax),%esi
  xor    %eax,%eax
  call   <printf@plt>
  mov    %r13,%rsp
  jmp    L155
L176:
  and    $0xfff,%eax
  sub    %rax,%rsp
  test   %rax,%rax
  jne    L83
L55:
  mov    %rsp,%rdi
  xor    %r14d,%r14d
  jmp    L149
  nopl   0x0(%rax,%rax,1)
L93:
  xor    %edi,%edi
  jmp    L232
L83:
  orq    $0x0,-0x8(%rsp,%rax,1)
  jmp    L55
L131:
  orq    $0x0,-0x8(%rsp,%rax,1)
  jmp    L127
L164:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: unpack_data
arguments: data_label: D18
datatype: string
name: unpack_data
arguments: data_label: D19
datatype: string
name: unpack_data
arguments: data_label: D26
datatype: string
name: unpack_data
arguments: data_label: D30
datatype: string

tool: D18: %d

tool: D19: %x

tool: D26: %s

tool: D30: 
%d

assistant: ```c
int main() {
  int n;
  int i = 0, j;
  char h[4];
  scanf("%d", &n);
  sprintf(h, "%x", n);
  int r = strlen(h);
  for (i = 0; i < r; i++)
    h[i] = toupper(h[i]);
  char b[r];
  for (i = r - 1, j = 0; i >= 0; i--, j++)
    b[j] = h[i];
  b[j] = '\0';
  if (strcmp(b, h) != 0) {
    char s1[r];
    char s2[r];
    do {
      sprintf(s1, "%d", n);
      r = strlen(s1);
      for (i = r - 1, j = 0; i >= 0; i--, j++)
        s2[j] = s1[i];
      s2[j] = '\0';
      n = n + 1;
    } while (strcmp(s1, s2) != 0);
    printf("\n%d", n - 1);
  } else
    printf("%s", h);
  return 0;
}
```