Problem:
Toggling Cases

Write a program which converts uppercase/lowercase letters to lowercase/uppercase for a given string.

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.

Constraints

The length of the input string < 1200

Sample Input

fAIR, LATER, OCCASIONALLY CLOUDY.

Sample Output

Fair, later, occasionally cloudy.

Solution in C# (judge verdict: Wrong Answer)

using System;

    class Program
    {
        static void Main(string[] args)
        {

            //文字列受け取り
            string str = Console.ReadLine();



            string str1 = str.ToUpper();

            Console.WriteLine(str1);



        }
    }