sWAP cASE

Switch case of all letters in a string.

You are given a string and your task is to swap cases. In other words, convert all lowercase letters to uppercase letters and vice versa.

For Example:

Www.HackerRank.com → wWW.hACKERrANK.COM
Pythonist 2 → pYTHONIST 2

Input Format:
A single line containing a string S.

Constraints:
* 0