Python 代码：解密字符串

import os

a = 0 flag = input()

for i in range(len(flag)): a += 1

if a != 32: print('error') exit()

if flag[0] != 'f' or flag[1] != 'l' or flag[2] != 'a' or flag[3] != 'g' or flag[4] != '{' or flag[31] != '}': print('error') exit()

tmp = [] for i in range(a): tmp.append(ord(flag[i]) - 9)

for i in range(a): tmp[i] ^= 51

for i in range(a): tmp[i] += 8

tmp1 = tmp[a-4] tmp2 = tmp[a-3] tmp3 = tmp[a-2]

for i in range(a-3): tmp[tmp3 + i - 1] = tmp[tmp3 + i]

tmp[0] = tmp3 tmp[1] = tmp2 tmp[2] = tmp1

for i in range(a): if i % 7 == 1: continue tmp[i] ^= 119

with open('out', 'w') as f: f.write(str(''.join([chr(x) for x in tmp])))

return None