using System;  

public class Exercise15  

{  

    public static void Main()

{

        Console.Write("Input Text: ");

        String input = Console.ReadLine();

        char[] arrInput = input.ToCharArray();

        foreach (char item in arrInput)

        {

            if((int)item<=90)

            {

                Console.Write((char)((int)item+32));

            }

            else

            {

                Console.Write((char)((int)item-32));

            }

        }

​

   }

 }

​