user: 请从给定的汇编指令推导出C源代码:

```asm
<main>:
  endbr64
  sub    $0x18,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x8(%rsp)
  xor    %eax,%eax
  lea    0x7(%rsp),%rsi
  lea    D260(%rip),%rdi
  call   <scanf@plt>
  cmpb   $0x61,0x7(%rsp)
  je     L62
L279:
  cmpb   $0x62,0x7(%rsp)
  je     L173
L194:
  cmpb   $0x63,0x7(%rsp)
  je     L357
L189:
  cmpb   $0x64,0x7(%rsp)
  je     L264
L314:
  cmpb   $0x65,0x7(%rsp)
  je     L284
L472:
  cmpb   $0x66,0x7(%rsp)
  je     L153
L119:
  cmpb   $0x67,0x7(%rsp)
  je     L105
L319:
  cmpb   $0x68,0x7(%rsp)
  je     L277
L525:
  cmpb   $0x69,0x7(%rsp)
  je     L78
L202:
  cmpb   $0x6a,0x7(%rsp)
  je     L345
L322:
  cmpb   $0x6b,0x7(%rsp)
  je     L50
L315:
  cmpb   $0x6c,0x7(%rsp)
  je     L94
L492:
  cmpb   $0x6d,0x7(%rsp)
  je     L512
L320:
  cmpb   $0x6e,0x7(%rsp)
  je     L418
L348:
  cmpb   $0x6f,0x7(%rsp)
  je     L350
L466:
  cmpb   $0x70,0x7(%rsp)
  je     L524
L57:
  cmpb   $0x71,0x7(%rsp)
  je     L473
L60:
  cmpb   $0x72,0x7(%rsp)
  je     L126
L476:
  cmpb   $0x73,0x7(%rsp)
  je     L382
L192:
  cmpb   $0x74,0x7(%rsp)
  je     L281
L367:
  cmpb   $0x75,0x7(%rsp)
  je     L258
L526:
  cmpb   $0x76,0x7(%rsp)
  je     L223
L164:
  cmpb   $0x77,0x7(%rsp)
  je     L157
L32:
  cmpb   $0x78,0x7(%rsp)
  je     L306
L58:
  cmpb   $0x79,0x7(%rsp)
  je     L313
L342:
  cmpb   $0x7a,0x7(%rsp)
  je     L12
L405:
  mov    0x8(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L293
  mov    $0x0,%eax
  add    $0x18,%rsp
  ret
L62:
  lea    D238(%rip),%rdi
  call   <printf@plt>
  jmp    L279
L173:
  lea    D85(%rip),%rdi
  call   <printf@plt>
  jmp    L194
L357:
  lea    D253(%rip),%rdi
  call   <printf@plt>
  jmp    L189
L264:
  lea    D43(%rip),%rdi
  call   <printf@plt>
  jmp    L314
L284:
  lea    D95(%rip),%rdi
  call   <printf@plt>
  jmp    L472
L153:
  lea    D169(%rip),%rdi
  call   <printf@plt>
  jmp    L119
L105:
  lea    D189(%rip),%rdi
  call   <printf@plt>
  jmp    L319
L277:
  lea    D226(%rip),%rdi
  call   <printf@plt>
  jmp    L525
L78:
  lea    D222(%rip),%rdi
  call   <printf@plt>
  jmp    L202
L345:
  lea    D194(%rip),%rdi
  call   <printf@plt>
  jmp    L322
L50:
  lea    D97(%rip),%rdi
  call   <printf@plt>
  jmp    L315
L94:
  lea    D132(%rip),%rdi
  call   <printf@plt>
  jmp    L492
L512:
  lea    D227(%rip),%rdi
  call   <printf@plt>
  jmp    L320
L418:
  lea    D139(%rip),%rdi
  call   <printf@plt>
  jmp    L348
L350:
  lea    D28(%rip),%rdi
  call   <printf@plt>
  jmp    L466
L524:
  lea    D81(%rip),%rdi
  call   <printf@plt>
  jmp    L57
L473:
  lea    D267(%rip),%rdi
  call   <printf@plt>
  jmp    L60
L126:
  lea    D79(%rip),%rdi
  call   <printf@plt>
  jmp    L476
L382:
  lea    D155(%rip),%rdi
  call   <printf@plt>
  jmp    L192
L281:
  lea    D235(%rip),%rdi
  call   <printf@plt>
  jmp    L367
L258:
  lea    D145(%rip),%rdi
  call   <printf@plt>
  jmp    L526
L223:
  lea    D113(%rip),%rdi
  call   <printf@plt>
  jmp    L164
L157:
  lea    D216(%rip),%rdi
  call   <printf@plt>
  jmp    L32
L306:
  lea    D149(%rip),%rdi
  call   <printf@plt>
  jmp    L58
L313:
  lea    D147(%rip),%rdi
  call   <printf@plt>
  jmp    L342
L12:
  lea    D170(%rip),%rdi
  call   <printf@plt>
  jmp    L405
L293:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: extract_symbolic_data
arguments: data_tag: D260
datatype: string
name: extract_symbolic_data
arguments: data_tag: D238
datatype: string
name: extract_symbolic_data
arguments: data_tag: D85
datatype: string
name: extract_symbolic_data
arguments: data_tag: D253
datatype: string
name: extract_symbolic_data
arguments: data_tag: D43
datatype: string
name: extract_symbolic_data
arguments: data_tag: D95
datatype: string
name: extract_symbolic_data
arguments: data_tag: D169
datatype: string
name: extract_symbolic_data
arguments: data_tag: D189
datatype: string
name: extract_symbolic_data
arguments: data_tag: D226
datatype: string
name: extract_symbolic_data
arguments: data_tag: D222
datatype: string
name: extract_symbolic_data
arguments: data_tag: D194
datatype: string
name: extract_symbolic_data
arguments: data_tag: D97
datatype: string
name: extract_symbolic_data
arguments: data_tag: D132
datatype: string
name: extract_symbolic_data
arguments: data_tag: D227
datatype: string
name: extract_symbolic_data
arguments: data_tag: D139
datatype: string
name: extract_symbolic_data
arguments: data_tag: D28
datatype: string
name: extract_symbolic_data
arguments: data_tag: D81
datatype: string
name: extract_symbolic_data
arguments: data_tag: D267
datatype: string
name: extract_symbolic_data
arguments: data_tag: D79
datatype: string
name: extract_symbolic_data
arguments: data_tag: D155
datatype: string
name: extract_symbolic_data
arguments: data_tag: D235
datatype: string
name: extract_symbolic_data
arguments: data_tag: D145
datatype: string
name: extract_symbolic_data
arguments: data_tag: D113
datatype: string
name: extract_symbolic_data
arguments: data_tag: D216
datatype: string
name: extract_symbolic_data
arguments: data_tag: D149
datatype: string
name: extract_symbolic_data
arguments: data_tag: D147
datatype: string
name: extract_symbolic_data
arguments: data_tag: D170
datatype: string

tool: D260: %s

tool: D238: 
z

tool: D85: 
y

tool: D253: 
x

tool: D43: 
w

tool: D95: 
v

tool: D169: 
u

tool: D189: 
t

tool: D226: 
s

tool: D222: 
r

tool: D194: 
q

tool: D97: 
p

tool: D132: 
o

tool: D227: 
n

tool: D139: 
m

tool: D28: 
l

tool: D81: 
k

tool: D267: 
j

tool: D79: 
i

tool: D155: 
h

tool: D235: 
g

tool: D145: 
f

tool: D113: 
e

tool: D216: 
d

tool: D149: 
c

tool: D147: 
b

tool: D170: 
a

assistant: ```c
int main() {
  char x;
  scanf("%s", &x);
  if (x == 97)
    printf("\nz");
  if (x == 98)
    printf("\ny");
  if (x == 99)
    printf("\nx");
  if (x == 100)
    printf("\nw");
  if (x == 101)
    printf("\nv");
  if (x == 102)
    printf("\nu");
  if (x == 103)
    printf("\nt");
  if (x == 104)
    printf("\ns");
  if (x == 105)
    printf("\nr");
  if (x == 106)
    printf("\nq");
  if (x == 107)
    printf("\np");
  if (x == 108)
    printf("\no");
  if (x == 109)
    printf("\nn");
  if (x == 110)
    printf("\nm");
  if (x == 111)
    printf("\nl");
  if (x == 112)
    printf("\nk");
  if (x == 113)
    printf("\nj");
  if (x == 114)
    printf("\ni");
  if (x == 115)
    printf("\nh");
  if (x == 116)
    printf("\ng");
  if (x == 117)
    printf("\nf");
  if (x == 118)
    printf("\ne");
  if (x == 119)
    printf("\nd");
  if (x == 120)
    printf("\nc");
  if (x == 121)
    printf("\nb");
  if (x == 122)
    printf("\na");
}
```