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Python3Scripts
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mooc_python
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bjdx_python_basic
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final_exam.py
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Python3Scripts
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mooc_python
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bjdx_python_basic
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final_exam.py
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#!/usr/bin/env python
# -*- coding:utf-8 -*-
__author__ = 'MFC'
__time__ = '2019-05-17 15:02'
"""
破译密码:
题目内容:
A国情报局抓获敌国间谍一名,从间谍身上搜出了若干密电,在严刑逼供之下,间谍说出了密电加密方法:将明文电报(仅由大写字母构成)中的所有字母均替换为字母表中向后看的第n个字母,如果超过Z,则从A继续数,这样就得到了密文,比如ATTACK,向后看第2个字母,就加密为CVVCEM。
可还没等到间谍说出加密用的密钥(数字n),就被卧底开枪打死,间谍临死前在地板上画了BYE三个字母。
情报局长看着一条条密电发了愁,但机智的你已经发现,原来间谍在告诉我们,所有密电的明文都以BYE结尾!
请编写程序破译这些密电吧!
输入格式:
共一行字符串,全部由大写字母构成的密文。
输出格式:
共一行字符串,破译后的明文。
输入样例1:
JNTQZCZF
输出样例1:
IMSPYBYE
"""
s = input()
a = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
n = a.index(s[-1])-a.index('E')
for t in s:
print(a[(a.index(t) - n) % 26], end='')
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