sol1-1.py

#!/usr/bin/env python
# encoding: utf-8
from string import lowercase

CIPHER = ""
CIPHER += "g fmnc wms bgblr rpylqjyrc gr zw fylb. rfyrq ufyr amknsrcpq "
CIPHER += "ypc dmp. bmgle gr gl zw fylb gq glcddgagclr ylb rfyr'q ufw r"
CIPHER += "fgq rcvr gq qm jmle. sqgle qrpgle.kyicrpylq() gq pcamkkclbcb"
CIPHER += ". lmu ynnjw ml rfc spj."


def caesar_decrypt(cipher, n):
    return "".join(
        ch.isalpha() and lowercase[
            (lowercase.index(ch) - n) % len(lowercase)
        ] or ch
        for ch in cipher
    )


def main():
    print caesar_decrypt(CIPHER, 24)