user: 请从给定的汇编指令推导出C源代码:

```asm
<main>:
  endbr64
  push   %r15
  mov    $0x2bc,%edi
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x2e8,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x2d8(%rsp)
  xor    %eax,%eax
  lea    0x10(%rsp),%r14
  call   <malloc@plt>
  mov    $0x2bc,%edi
  mov    %rax,%r13
  call   <malloc@plt>
  mov    $0x57,%ecx
  mov    %r14,%rdi
  mov    %r13,%rsi
  mov    %rax,%rbp
  movabs $0x3030303030303030,%rax
  rep stos %rax,%es:(%rdi)
  mov    %rbp,%rdx
  movl   $0x30303030,(%rdi)
  lea    D4(%rip),%rdi
  call   <scanf@plt>
  mov    %r13,%rdi
  call   <strlen@plt>
  mov    %r13,%rdi
  mov    %eax,%esi
  call   <resort@plt>
  mov    %rbp,%rdi
  call   <strlen@plt>
  mov    %rbp,%rdi
  mov    %eax,%esi
  call   <resort@plt>
  mov    %rbp,%rdi
  call   <strlen@plt>
  mov    %r13,%rdi
  mov    %eax,%r12d
  call   <strlen@plt>
  mov    %r12d,%esi
  mov    %eax,%edi
  call   <max@plt>
  mov    %eax,0x4(%rsp)
  test   %eax,%eax
  jle    L155
  mov    %r13,%rax
  mov    %r14,%r15
  xor    %r12d,%r12d
  xor    %ebx,%ebx
  sub    %r14,%rax
  mov    %rax,0x8(%rsp)
  jmp    L136
  cs nopw 0x0(%rax,%rax,1)
L65:
  sub    $0xa,%eax
  mov    $0x1,%r12d
  mov    %al,(%r15)
L157:
  lea    0x1(%rbx),%eax
  add    $0x1,%r15
  cmp    %eax,0x4(%rsp)
  je     L124
L132:
  movslq %eax,%rbx
L136:
  mov    %r13,%rdi
  call   <strlen@plt>
  cmp    %ebx,%eax
  jle    L94
  mov    0x8(%rsp),%rdx
  movzbl (%r15),%eax
  movzbl (%rdx,%r15,1),%ecx
  lea    -0x30(%rax,%rcx,1),%eax
  mov    %al,(%r15)
L94:
  mov    %rbp,%rdi
  call   <strlen@plt>
  cmp    %ebx,%eax
  movzbl (%r15),%eax
  jle    L100
  mov    %rbp,%rcx
  add    $0x30,%eax
  sub    %r14,%rcx
  sub    (%rcx,%r15,1),%al
  mov    %al,(%r15)
L100:
  add    %r12d,%eax
  cmp    $0x39,%al
  jg     L65
  cmp    $0x2f,%al
  jg     L88
  add    $0xa,%eax
  mov    $0xffffffff,%r12d
  add    $0x1,%r15
  mov    %al,-0x1(%r15)
  lea    0x1(%rbx),%eax
  cmp    %eax,0x4(%rsp)
  jne    L132
L124:
  test   %r12d,%r12d
  jne    L172
  movslq %eax,%rdx
  add    %r14,%rdx
  jmp    L141
  nopl   0x0(%rax,%rax,1)
L146:
  sub    $0x1,%rdx
  sub    $0x1,%eax
  je     L204
L141:
  cmpb   $0x30,(%rdx)
  je     L146
  movslq %eax,%rbx
  nopl   (%rax)
L154:
  movsbl (%r14,%rbx,1),%edi
  sub    $0x1,%rbx
  call   <putchar@plt>
  test   %ebx,%ebx
  jns    L154
L71:
  mov    %r13,%rdi
  call   <free@plt>
  mov    %rbp,%rdi
  call   <free@plt>
  mov    0x2d8(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L224
  add    $0x2e8,%rsp
  xor    %eax,%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L172:
  cmp    $0xffffffff,%r12d
  jne    L52
  mov    $0x2d,%edi
  mov    $0x69,%r15d
  call   <putchar@plt>
  movslq %ebx,%rax
  add    %rax,%r14
  mov    %r14,%r12
  nopl   0x0(%rax)
L114:
  mov    %r15d,%edi
  sub    (%r12),%dil
  sub    $0x1,%r12
  mov    %dil,0x1(%r12)
  movsbl %dil,%edi
  call   <putchar@plt>
  mov    %ebx,%eax
  sub    %r14d,%eax
  add    %r12d,%eax
  jns    L114
  jmp    L71
L204:
  xor    %ebx,%ebx
  jmp    L154
L52:
  sub    $0x1,%r12d
  jne    L154
  mov    $0x31,%edi
  call   <putchar@plt>
  jmp    L154
L155:
  mov    $0x0,%ebx
  je     L154
  jmp    L71
L224:
  call   <__stack_chk_fail@plt>
L88:
  mov    %al,(%r15)
  xor    %r12d,%r12d
  jmp    L157
```

tool_calls: name: read_data
arguments: data_label: D4
type_guessed: string

tool: D4: %s%s

assistant: ```c
int main(int argc, char *argv[]) {
  char *a, *b;
  char c[700];
  int i, mark = 0, a0 = 0, b0 = 0;
  a = (char *)malloc(700 * sizeof(char));
  b = (char *)malloc(700 * sizeof(char));
  for (i = 0; i < sizeof(c); i++)
    c[i] = '0';
  scanf("%s%s", a, b);
  b0 = 1;
  resort(a, strlen(a));
  resort(b, strlen(b));
  int size = max(strlen(a), strlen(b));
  for (i = 0; i < size; i++) {
    if (i < strlen(a)) {
      if (!(a0 == b0) && a0)
        c[i] -= a[i] - '0';
      else
        c[i] += a[i] - '0';
    }
    if (i < strlen(b)) {
      if (!(a0 == b0) && b0)
        c[i] -= b[i] - '0';
      else
        c[i] += b[i] - '0';
    }
    c[i] += mark;
    mark = 0;
    if (c[i] > '9') {
      c[i] -= 10;
      mark = 1;
    }
    if (c[i] < '0') {
      c[i] += 10;
      mark = -1;
    }
  }
  for (i = size; i > 0; i--)
    if (c[i] != '0' || mark) {
      if (mark)
        i--;
      break;
    }
  if (mark < 0 || a0 && b0)
    printf("-");
  if (mark > 0)
    printf("1");
  for (; i >= 0; i--) {
    if (mark < 0 && (a0 != b0))
      c[i] = '9' - (c[i] - '0');
    printf("%c", c[i]);
  }
  free(a);
  free(b);
  return 0;
}
```