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: Accepted)

using System;
public class Hello{
    public static void Main(){
        var s = Console.ReadLine();
        var ans = "";
        for(var i = 0;i < s.Length;i++){
            if(char.IsUpper(s[i])){
                ans += s[i].ToString().ToLower();
            }else{
                ans += s[i].ToString().ToUpper();
            }
        }
        Console.WriteLine(ans);
    }
}