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Background

针对输入字符的大小写进行转化

Description

把一个字符串中所有出现的大写字母都替换成小写字母，同时把小写字母替换成大写字母。

Format

Input

输入一行：待互换的字符串。

Output

输出一行：完成互换的字符串（字符串的长度小于80）

Samples

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Limitation

1s, 1024KiB for each test case.