Problem D: 字母前趋

Problem D: 字母前趋

Time Limit: 1 Sec  Memory Limit: 128 MB
Submit: 280  Solved: 139
[Status] [Submit] [Creator:]

Description

输入一个字母，编程输出该字母的前趋字母。

Sample Input Copy 

B

Sample Output Copy 

A
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