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
  push   %r13
  push   %r12
  push   %rbx
  sub    $0x98,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,-0x38(%rbp)
  xor    %eax,%eax
  mov    %rsp,%rax
  mov    %rax,%rbx
  lea    -0x74(%rbp),%rax
  lea    -0x78(%rbp),%rcx
  mov    %rax,%rdx
  mov    %rcx,%rsi
  lea    D18(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <scanf@plt>
  mov    -0x78(%rbp),%eax
  lea    0x1(%rax),%edx
  movslq %edx,%rax
  sub    $0x1,%rax
  mov    %rax,-0x68(%rbp)
  movslq %edx,%rax
  mov    %rax,-0x90(%rbp)
  movq   $0x0,-0x88(%rbp)
  movslq %edx,%rax
  mov    %rax,-0xa0(%rbp)
  movq   $0x0,-0x98(%rbp)
  movslq %edx,%rax
  mov    $0x10,%edx
  sub    $0x1,%rdx
  add    %rdx,%rax
  mov    $0x10,%edi
  mov    $0x0,%edx
  div    %rdi
  imul   $0x10,%rax,%rax
  mov    %rax,%rcx
  and    $0xfffffffffffff000,%rcx
  mov    %rsp,%rdx
  sub    %rcx,%rdx
L123:
  cmp    %rdx,%rsp
  je     L86
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L123
L86:
  mov    %rax,%rdx
  and    $0xfff,%edx
  sub    %rdx,%rsp
  mov    %rax,%rdx
  and    $0xfff,%edx
  test   %rdx,%rdx
  je     L39
  and    $0xfff,%eax
  sub    $0x8,%rax
  add    %rsp,%rax
  orq    $0x0,(%rax)
L39:
  mov    %rsp,%rax
  add    $0x0,%rax
  mov    %rax,-0x60(%rbp)
  mov    -0x74(%rbp),%eax
  add    $0x1,%eax
  movslq %eax,%rdx
  sub    $0x1,%rdx
  mov    %rdx,-0x58(%rbp)
  movslq %eax,%rdx
  mov    %rdx,-0xb0(%rbp)
  movq   $0x0,-0xa8(%rbp)
  movslq %eax,%rdx
  mov    %rdx,-0xc0(%rbp)
  movq   $0x0,-0xb8(%rbp)
  cltq
  mov    $0x10,%edx
  sub    $0x1,%rdx
  add    %rdx,%rax
  mov    $0x10,%edi
  mov    $0x0,%edx
  div    %rdi
  imul   $0x10,%rax,%rax
  mov    %rax,%rcx
  and    $0xfffffffffffff000,%rcx
  mov    %rsp,%rdx
  sub    %rcx,%rdx
L121:
  cmp    %rdx,%rsp
  je     L102
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L121
L102:
  mov    %rax,%rdx
  and    $0xfff,%edx
  sub    %rdx,%rsp
  mov    %rax,%rdx
  and    $0xfff,%edx
  test   %rdx,%rdx
  je     L42
  and    $0xfff,%eax
  sub    $0x8,%rax
  add    %rsp,%rax
  orq    $0x0,(%rax)
L42:
  mov    %rsp,%rax
  add    $0x0,%rax
  mov    %rax,-0x50(%rbp)
  mov    -0x74(%rbp),%eax
  add    $0x1,%eax
  movslq %eax,%rdx
  sub    $0x1,%rdx
  mov    %rdx,-0x48(%rbp)
  movslq %eax,%rdx
  mov    %rdx,%r14
  mov    $0x0,%r15d
  movslq %eax,%rdx
  mov    %rdx,%r12
  mov    $0x0,%r13d
  cltq
  mov    $0x10,%edx
  sub    $0x1,%rdx
  add    %rdx,%rax
  mov    $0x10,%esi
  mov    $0x0,%edx
  div    %rsi
  imul   $0x10,%rax,%rax
  mov    %rax,%rcx
  and    $0xfffffffffffff000,%rcx
  mov    %rsp,%rdx
  sub    %rcx,%rdx
L94:
  cmp    %rdx,%rsp
  je     L62
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L94
L62:
  mov    %rax,%rdx
  and    $0xfff,%edx
  sub    %rdx,%rsp
  mov    %rax,%rdx
  and    $0xfff,%edx
  test   %rdx,%rdx
  je     L92
  and    $0xfff,%eax
  sub    $0x8,%rax
  add    %rsp,%rax
  orq    $0x0,(%rax)
L92:
  mov    %rsp,%rax
  add    $0x0,%rax
  mov    %rax,-0x40(%rbp)
  mov    -0x74(%rbp),%eax
  mov    -0x40(%rbp),%rdx
  cltq
  movb   $0x0,(%rdx,%rax,1)
  mov    -0x60(%rbp),%rax
  mov    %rax,%rsi
  lea    D13(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <scanf@plt>
  mov    -0x50(%rbp),%rax
  mov    %rax,%rsi
  lea    D13(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <scanf@plt>
  movl   $0x0,-0x70(%rbp)
  jmp    L34
L18:
  mov    -0x78(%rbp),%eax
  sub    $0x1,%eax
  sub    -0x70(%rbp),%eax
  mov    -0x74(%rbp),%edx
  sub    $0x1,%edx
  mov    %edx,%esi
  sub    -0x70(%rbp),%esi
  mov    -0x60(%rbp),%rdx
  cltq
  movzbl (%rdx,%rax,1),%ecx
  mov    -0x40(%rbp),%rdx
  movslq %esi,%rax
  mov    %cl,(%rdx,%rax,1)
  addl   $0x1,-0x70(%rbp)
L34:
  mov    -0x78(%rbp),%eax
  cmp    %eax,-0x70(%rbp)
  jl     L18
  mov    -0x74(%rbp),%eax
  mov    -0x78(%rbp),%edx
  sub    %edx,%eax
  sub    $0x1,%eax
  mov    %eax,-0x6c(%rbp)
  jmp    L55
L67:
  mov    -0x78(%rbp),%edx
  mov    -0x6c(%rbp),%eax
  add    %edx,%eax
  mov    -0x50(%rbp),%rdx
  cltq
  movzbl (%rdx,%rax,1),%eax
  movsbl %al,%ecx
  mov    -0x78(%rbp),%edx
  mov    -0x6c(%rbp),%eax
  add    %edx,%eax
  mov    -0x40(%rbp),%rdx
  cltq
  movzbl (%rdx,%rax,1),%eax
  movsbl %al,%edx
  mov    %ecx,%eax
  sub    %edx,%eax
  add    $0x1a,%eax
  movslq %eax,%rdx
  imul   $0x4ec4ec4f,%rdx,%rdx
  shr    $0x20,%rdx
  sar    $0x3,%edx
  mov    %eax,%ecx
  sar    $0x1f,%ecx
  sub    %ecx,%edx
  imul   $0x1a,%edx,%ecx
  sub    %ecx,%eax
  mov    %eax,%edx
  mov    %edx,%eax
  add    $0x61,%eax
  mov    %eax,%ecx
  mov    -0x40(%rbp),%rdx
  mov    -0x6c(%rbp),%eax
  cltq
  mov    %cl,(%rdx,%rax,1)
  subl   $0x1,-0x6c(%rbp)
L55:
  cmpl   $0x0,-0x6c(%rbp)
  jns    L67
  mov    -0x40(%rbp),%rax
  mov    %rax,%rdi
  call   <puts@plt>
  mov    $0x0,%eax
  mov    %rbx,%rsp
  mov    -0x38(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L115
  call   <__stack_chk_fail@plt>
L115:
  lea    -0x28(%rbp),%rsp
  pop    %rbx
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  pop    %rbp
  ret
```

tool_calls: name: read_data
arguments: data_tag: D18
datatype: string
name: read_data
arguments: data_tag: D13
datatype: string

tool: D18: %d %d

tool: D13: %s

assistant: ```c
int main() {
  int n, m;
  scanf("%d %d", &n, &m);
  char last[n + 1], encrypted[m + 1], plain[m + 1];
  plain[m] = 0;
  scanf("%s", last);
  scanf("%s", encrypted);
  for (int i = 0; i < n; i++)
    plain[m - 1 - i] = last[n - 1 - i];
  for (int i = m - n - 1; i >= 0; i--)
    plain[i] = (char)(((26 + (((encrypted[i + n]) - 'a') - ((plain[n + i]) - 'a'))) % 26) + 'a');
  printf("%s\n", plain);
  return 0;
}
```