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: WA: Presentation Error)

using System;

namespace ConsoleApplication4
{
    class Program
    {
        static void Main(string[] args)
        {
            String Input = Console.ReadLine();
            Char[] input = Input.ToCharArray();
            for (int i = 0; i < input.Length; i++)
            {
                if (char.IsUpper(input[i]))
                {
                    input[i] = char.ToLower(input[i]);
                    Console.Write(input[i]);
                }
                else if (char.IsLower(input[i]))
                {
                    input[i] = char.ToUpper(input[i]);
                    Console.Write(input[i]);
                }
                else
                    Console.Write(input[i]);
            }
        }
    }
}