Szyfr cezara

import sys

available = [0,0,0,0,0,0,0,0,0,10,10,10,10,10,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,10,8,8,5,5,6,5,8,8,8,7,7,8,8,8,7,7,7,7,7,7,7,7,7,7,7,8,8,7,7,7,8,6,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,7,5,7,6,5,4,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,7,5,7,6,0]

def alfa_test(text, c, strong):

text = crypt(text, c)

for d in text:

if(ord(d)>=128 or available[ord(d)]<strong):

return False

return True

def decrypt(text):

lst = []

for i in range(0, 256):

lst.append(True)

lst2 = list(lst)

for j in range(0,11):

for i in range(0, 256):

if(not alfa_test(text, i, j)):

lst[i] = False

if True in lst:

for i in range(0, 256):

lst2[i] = lst[i];

else: break

for i in range(0, 256):

if lst2[i]:

return crypt(text, i)

return None

def crypt(text, num):

res = []

reslen = len(text)

for i in range(0, reslen):

res.append(chr((ord(text[i]) + num)%256));

return "".join(res)

def main():

text = sys.stdin.read()

print(decrypt(crypt(text, 123)))

main()