user: 请从给定的汇编指令推导出C源代码:

```asm
<main>:
  endbr64
  sub    $0x18,%rsp
  lea    D97(%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     L28
L53:
  cmp    $0x62,%al
  je     L453
L80:
  cmp    $0x63,%al
  je     L191
L476:
  cmp    $0x64,%al
  je     L420
L468:
  cmp    $0x65,%al
  je     L194
L120:
  cmp    $0x66,%al
  je     L221
L477:
  cmp    $0x67,%al
  je     L386
L185:
  cmp    $0x68,%al
  je     L487
L179:
  cmp    $0x69,%al
  je     L20
L395:
  cmp    $0x6a,%al
  je     L16
L409:
  cmp    $0x6b,%al
  je     L123
L349:
  cmp    $0x6c,%al
  je     L202
L372:
  cmp    $0x6d,%al
  je     L518
L323:
  cmp    $0x6e,%al
  je     L130
L460:
  cmp    $0x6f,%al
  je     L455
L3:
  cmp    $0x70,%al
  je     L254
L188:
  cmp    $0x71,%al
  je     L449
L4:
  cmp    $0x72,%al
  je     L11
L450:
  cmp    $0x73,%al
  je     L424
L415:
  cmp    $0x74,%al
  je     L227
L456:
  cmp    $0x75,%al
  je     L346
L494:
  cmp    $0x76,%al
  je     L180
L376:
  cmp    $0x77,%al
  je     L74
L239:
  cmp    $0x78,%al
  je     L509
L411:
  cmp    $0x79,%al
  je     L5
L198:
  cmp    $0x7a,%al
  je     L15
L378:
  mov    0x8(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L365
  xor    %eax,%eax
  add    $0x18,%rsp
  ret
L28:
  lea    D160(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L53
L15:
  lea    D153(%rip),%rdi
  call   <printf@plt>
  jmp    L378
L5:
  lea    D265(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L198
L509:
  lea    D56(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L411
L74:
  lea    D263(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L239
L180:
  lea    D107(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L376
L346:
  lea    D194(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L494
L227:
  lea    D52(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L456
L424:
  lea    D17(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L415
L11:
  lea    D102(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L450
L449:
  lea    D110(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L4
L254:
  lea    D210(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L188
L455:
  lea    D117(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L3
L130:
  lea    D152(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L460
L518:
  lea    D148(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L323
L202:
  lea    D90(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L372
L123:
  lea    D109(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L349
L16:
  lea    D85(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L409
L20:
  lea    D176(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L395
L487:
  lea    D139(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L179
L386:
  lea    D59(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L185
L221:
  lea    D62(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L477
L194:
  lea    D203(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L120
L420:
  lea    D5(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L468
L191:
  lea    D18(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L476
L453:
  lea    D111(%rip),%rdi
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  jmp    L80
L365:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: read_data
arguments: tag: D97
data_type: string
name: read_data
arguments: tag: D160
data_type: string
name: read_data
arguments: tag: D153
data_type: string
name: read_data
arguments: tag: D265
data_type: string
name: read_data
arguments: tag: D56
data_type: string
name: read_data
arguments: tag: D263
data_type: string
name: read_data
arguments: tag: D107
data_type: string
name: read_data
arguments: tag: D194
data_type: string
name: read_data
arguments: tag: D52
data_type: string
name: read_data
arguments: tag: D17
data_type: string
name: read_data
arguments: tag: D102
data_type: string
name: read_data
arguments: tag: D110
data_type: string
name: read_data
arguments: tag: D210
data_type: string
name: read_data
arguments: tag: D117
data_type: string
name: read_data
arguments: tag: D152
data_type: string
name: read_data
arguments: tag: D148
data_type: string
name: read_data
arguments: tag: D90
data_type: string
name: read_data
arguments: tag: D109
data_type: string
name: read_data
arguments: tag: D85
data_type: string
name: read_data
arguments: tag: D176
data_type: string
name: read_data
arguments: tag: D139
data_type: string
name: read_data
arguments: tag: D59
data_type: string
name: read_data
arguments: tag: D62
data_type: string
name: read_data
arguments: tag: D203
data_type: string
name: read_data
arguments: tag: D5
data_type: string
name: read_data
arguments: tag: D18
data_type: string
name: read_data
arguments: tag: D111
data_type: string

tool: D97: %c

tool: D160: 
z

tool: D153: 
a

tool: D265: 
b

tool: D56: 
c

tool: D263: 
d

tool: D107: 
e

tool: D194: 
f

tool: D52: 
g

tool: D17: 
h

tool: D102: 
i

tool: D110: 
j

tool: D210: 
k

tool: D117: 
l

tool: D152: 
m

tool: D148: 
n

tool: D90: 
o

tool: D109: 
p

tool: D85: 
q

tool: D176: 
r

tool: D139: 
s

tool: D59: 
t

tool: D62: 
u

tool: D203: 
v

tool: D5: 
w

tool: D18: 
x

tool: D111: 
y

assistant: ```c
int main() {
  char l;
  scanf("%c", &l);
  if (l == 'a')
    printf("\nz");
  if (l == 'b')
    printf("\ny");
  if (l == 'c')
    printf("\nx");
  if (l == 'd')
    printf("\nw");
  if (l == 'e')
    printf("\nv");
  if (l == 'f')
    printf("\nu");
  if (l == 'g')
    printf("\nt");
  if (l == 'h')
    printf("\ns");
  if (l == 'i')
    printf("\nr");
  if (l == 'j')
    printf("\nq");
  if (l == 'k')
    printf("\np");
  if (l == 'l')
    printf("\no");
  if (l == 'm')
    printf("\nn");
  if (l == 'n')
    printf("\nm");
  if (l == 'o')
    printf("\nl");
  if (l == 'p')
    printf("\nk");
  if (l == 'q')
    printf("\nj");
  if (l == 'r')
    printf("\ni");
  if (l == 's')
    printf("\nh");
  if (l == 't')
    printf("\ng");
  if (l == 'u')
    printf("\nf");
  if (l == 'v')
    printf("\ne");
  if (l == 'w')
    printf("\nd");
  if (l == 'x')
    printf("\nc");
  if (l == 'y')
    printf("\nb");
  if (l == 'z')
    printf("\na");
  return 0;
}
```