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;

namespace ConsoleApplication5
{
    class Program
    {
        static void Main(string[] args)
        {
            char[] input = Console.ReadLine().ToCharArray();

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

            Console.WriteLine(input);
        }
    }
}