Python 语言程序设计(2017 年秋)

1015. Case Transformation

单点时限: 2.0 sec

内存限制: 256 MB

Input a line of charactors, replace all lowercase letters with corresponding uppercase letters and all uppercase letters with corresponding lowercase letters, and output the string.

输入格式

Only one line, representing the string that needs to be transform.

输出格式

Only one line, the result string.

样例

Input
Hello, world!
Output
hELLO, WORLD!

提示

All non-letter characters should not be transformed.

不限期开放

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