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（字符串长度小于350）。

Samples

If so, you already have a Google Account. You can sign in on the right.

iF SO, YOU ALREADY HAVE A gOOGLE aCCOUNT. yOU CAN SIGN IN ON THE RIGHT.

Limitation

1s, 1024KiB for each test case.