using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Enter the word");

        string words = Console.ReadLine();

        foreach(char letter in words)

        {

            if(Char.IsUpper(letter))

            {

                Console.Write(char.ToLower(letter));

            }

            else

            {

                Console.Write(char.ToUpper(letter));

            }

        }

    }

}