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 ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
                string input = Console.ReadLine();
                char[] change = input.ToCharArray();

                for (int i = 0; i < change.Length; i++)
                {
                    if (char.IsLower(change[i]))
                    {
                        change[i] = char.ToUpper(change[i]);
                    }else if(char.IsUpper(change[i])){
                        change[i] = char.ToLower(change[i]);
                    }
                }

                for (int i = 0; i < change.Length; i++)
                {
                    Console.Write(string.Format("{0}", change[i]));
                }               
        }
    }
}