电报文字
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Description
输入一行电报文字，将字母变成其下一字母（如’a’变成’b’……’z’变成’ａ’其它字符不变）。
电报长度<=1000
Input Format
一行字符
Output Format
加密处理后的字符
Sample
样例输入
a b
样例输出
b c