#!/usr/bin/python
import sys
from secret import key

def encrypt(plaintext,key):
    key_format = []
    index = 0
    ciphertext = ''
    alpha = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'

    for c in key:
        if c.upper() in alpha:
            key_format.append(alpha.index(c.upper()))

    for c in plaintext:
        if c.upper() in alpha:
            if c in alpha:
                if alpha.index(c) + key_format[index] > 25:
                    ciphertext += alpha[alpha.index(c) + key_format[index] - 26]
                else:
                    ciphertext += alpha[alpha.index(c) + key_format[index]]
            else:
                if alpha.index(c.upper()) + key_format[index] > 25:
                    ciphertext += alpha[alpha.index(c.upper()) + key_format[index] - 26].lower()
                else:
                    ciphertext += alpha[alpha.index(c.upper()) + key_format[index]].lower()
            index += 1
            if index >= len(key_format):
                index = 0
        else:
            ciphertext += c
    return ciphertext

if __name__=="__main__":
    assert(len(key)==14)
    with open(sys.argv[1]) as f:
        plaintext = f.read()
    print(encrypt(plaintext,key))