user: Please show me the C implementation that matches the assembly code listed below:

```asm
<main>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbx
  sub    $0x28,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,-0x38(%rbp)
  xor    %eax,%eax
  lea    -0x3c(%rbp),%rsi
  lea    D3(%rip),%rdi
  call   <scanf@plt>
  mov    -0x3c(%rbp),%edx
  movslq %edx,%rax
  lea    0xf(,%rax,4),%rax
  mov    %rax,%rsi
  and    $0xfffffffffffffff0,%rsi
  and    $0xfffffffffffff000,%rax
  mov    %rsp,%rcx
  sub    %rax,%rcx
L196:
  cmp    %rcx,%rsp
  je     L51
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L196
L51:
  mov    %rsi,%rax
  and    $0xfff,%eax
  sub    %rax,%rsp
  test   %rax,%rax
  je     L63
  orq    $0x0,-0x8(%rsp,%rax,1)
L63:
  mov    %rsp,%r12
  test   %edx,%edx
  jle    L49
  mov    %r12,%r13
  mov    $0x0,%ebx
  lea    D3(%rip),%r14
L107:
  mov    %r13,%rsi
  mov    %r14,%rdi
  call   <scanf@plt>
  add    $0x1,%ebx
  add    $0x4,%r13
  cmp    %ebx,-0x3c(%rbp)
  jg     L107
  mov    $0x61,%r13d
  jmp    L202
L85:
  cmp    %ebx,-0x3c(%rbp)
  jle    L245
  add    $0x1,%r13d
  cmp    $0x7b,%r13d
  je     L245
L202:
  cmpl   $0x0,-0x3c(%rbp)
  jle    L245
  mov    $0x0,%ebx
L146:
  mov    %r13d,%edi
  xor    (%r12,%rbx,4),%edi
  call   <ck@plt>
  cmp    $0x1,%eax
  jne    L85
  add    $0x3,%rbx
  cmp    %ebx,-0x3c(%rbp)
  jg     L146
L245:
  mov    %r13b,-0x41(%rbp)
  mov    $0x61,%r13d
  jmp    L99
L136:
  cmp    %ebx,-0x3c(%rbp)
  jle    L189
  add    $0x1,%r13d
  cmp    $0x7b,%r13d
  je     L189
L99:
  cmpl   $0x1,-0x3c(%rbp)
  jle    L189
  mov    $0x1,%ebx
L236:
  mov    %r13d,%edi
  xor    (%r12,%rbx,4),%edi
  call   <ck@plt>
  cmp    $0x1,%eax
  jne    L136
  add    $0x3,%rbx
  cmp    %ebx,-0x3c(%rbp)
  jg     L236
L189:
  mov    $0x61,%r14d
  jmp    L61
L214:
  cmp    %ebx,-0x3c(%rbp)
  jle    L103
  add    $0x1,%r14d
  cmp    $0x7b,%r14d
  je     L103
L61:
  cmpl   $0x2,-0x3c(%rbp)
  jle    L103
  mov    $0x2,%ebx
L162:
  mov    %r14d,%edi
  xor    (%r12,%rbx,4),%edi
  call   <ck@plt>
  cmp    $0x1,%eax
  jne    L214
  add    $0x3,%rbx
  cmp    %ebx,-0x3c(%rbp)
  jg     L162
L103:
  movsbl %r14b,%ecx
  movsbl %r13b,%edx
  movsbl -0x41(%rbp),%esi
  lea    D12(%rip),%rdi
  call   <printf@plt>
  mov    -0x38(%rbp),%rax
  sub    %fs:0x28,%rax
  jne    L200
  mov    $0x0,%eax
  lea    -0x28(%rbp),%rsp
  pop    %rbx
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  pop    %rbp
  ret
L49:
  mov    $0x61,%r13d
  jmp    L245
L200:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: unpack_data
arguments: data_label: D3
type_guessed: string
name: unpack_data
arguments: data_label: D12
type_guessed: string

tool: D3: %d

tool: D12: %c%c%c

assistant: ```c
int main() {
  int n, j, i;
  char a, b, c;
  scanf("%d", &n);
  int m[n];
  for (i = 0; i < n; i++)
    scanf("%d", &m[i]);
  for (i = 97; i <= 122; i++) {
    for (j = 0; j < n; j += 3)
      if (ck(m[j] ^ i) != 1)
        break;
    if (j >= n)
      break;
  }
  a = i;
  for (i = 97; i <= 122; i++) {
    for (j = 1; j < n; j += 3)
      if (ck(m[j] ^ i) != 1)
        break;
    if (j >= n)
      break;
  }
  b = i;
  for (i = 97; i <= 122; i++) {
    for (j = 2; j < n; j += 3)
      if (ck(m[j] ^ i) != 1)
        break;
    if (j >= n)
      break;
  }
  c = i;
  printf("%c%c%c", a, b, c);
  return 0;
}
```