题目描述
Write a program which converts uppercase/lowercase letters to lowercase/uppercase for a given string.
Constraints
- The length of the input string < 1200
Input
A string is given in a line.
Output
Print the converted string in a line. Note that you do not need to convert any characters other than alphabetical letters.
Example
Input
fAIR, LATER, OCCASIONALLY CLOUDY.
Output
Fair, later, occasionally cloudy.
输入格式
见题面
输出格式
见题面
样例输入
fAIR, LATER, OCCASIONALLY CLOUDY.
样例输出
Fair, later, occasionally cloudy.