user: 请将以下的汇编代码转换成C语言代码：

```asm
<main>:
  endbr64
  sub    $0x18,%rsp
  lea    D54(%rip),%rdi
  mov    %fs:0x28,%rax
  mov    %rax,0x8(%rsp)
  xor    %eax,%eax
  lea    0x7(%rsp),%rsi
  call   <scanf@plt>
  movzbl 0x7(%rsp),%eax
  cmp    $0x61,%al
  je     L68
L90:
  cmp    $0x62,%al
  je     L388
L151:
  cmp    $0x63,%al
  je     L512
L368:
  cmp    $0x64,%al
  je     L262
L219:
  cmp    $0x65,%al
  je     L106
L284:
  cmp    $0x66,%al
  je     L423
L1:
  cmp    $0x67,%al
  je     L435
L499:
  cmp    $0x68,%al
  je     L179
L198:
  cmp    $0x69,%al
  je     L382
L61:
  cmp    $0x6a,%al
  je     L508
L74:
  cmp    $0x6b,%al
  je     L22
L111:
  cmp    $0x6c,%al
  je     L333
L520:
  cmp    $0x6d,%al
  je     L50
L450:
  cmp    $0x6e,%al
  je     L248
L390:
  cmp    $0x6f,%al
  je     L245
L231:
  cmp    $0x70,%al
  je     L415
L344:
  cmp    $0x71,%al
  je     L312
L481:
  cmp    $0x72,%al
  je     L118
L509:
  cmp    $0x73,%al
  je     L30
L324:
  cmp    $0x74,%al
  je     L383
L108:
  cmp    $0x75,%al
  je     L286
L412:
  cmp    $0x76,%al
  je     L523
L156:
  cmp    $0x77,%al
  je     L418
L123:
  cmp    $0x78,%al
  je     L149
L136:
  cmp    $0x79,%al
  je     L445
L490:
  cmp    $0x7a,%al
  je     L308
L254:
  mov    0x8(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L113
  xor    %eax,%eax
  add    $0x18,%rsp
  ret
L68:
  lea    D85(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L90
L308:
  lea    D184(%rip),%rdi
  call   <printf@plt>
  jmp    L254
L445:
  lea    D37(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L490
L149:
  lea    D149(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L136
L418:
  lea    D44(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L123
L523:
  lea    D198(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L156
L286:
  lea    D187(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L412
L383:
  lea    D268(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L108
L30:
  lea    D223(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L324
L118:
  lea    D221(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L509
L312:
  lea    D213(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L481
L415:
  lea    D4(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L344
L245:
  lea    D127(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L231
L248:
  lea    D160(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L390
L50:
  lea    D81(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L450
L333:
  lea    D256(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L520
L22:
  lea    D22(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L111
L508:
  lea    D67(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L74
L382:
  lea    D13(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L61
L179:
  lea    D75(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L198
L435:
  lea    D121(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L499
L423:
  lea    D210(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L1
L106:
  lea    D108(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L284
L262:
  lea    D182(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L219
L512:
  lea    D6(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L368
L388:
  lea    D32(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L151
L113:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: unpack_data
arguments: label: D54
data_type: string
name: unpack_data
arguments: label: D85
data_type: string
name: unpack_data
arguments: label: D184
data_type: string
name: unpack_data
arguments: label: D37
data_type: string
name: unpack_data
arguments: label: D149
data_type: string
name: unpack_data
arguments: label: D44
data_type: string
name: unpack_data
arguments: label: D198
data_type: string
name: unpack_data
arguments: label: D187
data_type: string
name: unpack_data
arguments: label: D268
data_type: string
name: unpack_data
arguments: label: D223
data_type: string
name: unpack_data
arguments: label: D221
data_type: string
name: unpack_data
arguments: label: D213
data_type: string
name: unpack_data
arguments: label: D4
data_type: string
name: unpack_data
arguments: label: D127
data_type: string
name: unpack_data
arguments: label: D160
data_type: string
name: unpack_data
arguments: label: D81
data_type: string
name: unpack_data
arguments: label: D256
data_type: string
name: unpack_data
arguments: label: D22
data_type: string
name: unpack_data
arguments: label: D67
data_type: string
name: unpack_data
arguments: label: D13
data_type: string
name: unpack_data
arguments: label: D75
data_type: string
name: unpack_data
arguments: label: D121
data_type: string
name: unpack_data
arguments: label: D210
data_type: string
name: unpack_data
arguments: label: D108
data_type: string
name: unpack_data
arguments: label: D182
data_type: string
name: unpack_data
arguments: label: D6
data_type: string
name: unpack_data
arguments: label: D32
data_type: string

tool: D54: %c

tool: D85: z


tool: D184: a


tool: D37: b


tool: D149: c


tool: D44: d


tool: D198: e


tool: D187: f


tool: D268: g


tool: D223: h


tool: D221: i


tool: D213: j


tool: D4: k


tool: D127: l


tool: D160: m


tool: D81: n


tool: D256: o


tool: D22: p


tool: D67: q


tool: D13: r


tool: D75: s


tool: D121: t


tool: D210: u


tool: D108: v


tool: D182: w


tool: D6: x


tool: D32: y


assistant: ```c
int main() {
  char S;
  scanf("%c", &S);
  if (S == 97)
    printf("z\n");
  if (S == 98)
    printf("y\n");
  if (S == 99)
    printf("x\n");
  if (S == 100)
    printf("w\n");
  if (S == 101)
    printf("v\n");
  if (S == 102)
    printf("u\n");
  if (S == 103)
    printf("t\n");
  if (S == 104)
    printf("s\n");
  if (S == 105)
    printf("r\n");
  if (S == 106)
    printf("q\n");
  if (S == 107)
    printf("p\n");
  if (S == 108)
    printf("o\n");
  if (S == 109)
    printf("n\n");
  if (S == 110)
    printf("m\n");
  if (S == 111)
    printf("l\n");
  if (S == 112)
    printf("k\n");
  if (S == 113)
    printf("j\n");
  if (S == 114)
    printf("i\n");
  if (S == 115)
    printf("h\n");
  if (S == 116)
    printf("g\n");
  if (S == 117)
    printf("f\n");
  if (S == 118)
    printf("e\n");
  if (S == 119)
    printf("d\n");
  if (S == 120)
    printf("c\n");
  if (S == 121)
    printf("b\n");
  if (S == 122)
    printf("a\n");
  return 0;
}
```