using System;

using System.Text; 

public class Program

{

    public static void Main()

    {

        StringBuilder b= new StringBuilder(Console.ReadLine());

        string a;

        int c=1;

        a=Console.ReadLine();

        a=b.ToString();

        for(int i=0;i<b.Length;i++)

        { 

            if(c==1)

            {

                b[i]=Convert.ToChar(b[i].ToString().ToUpper());

                c=0;

            }

            else

            {

                b[i]=Convert.ToChar(b[i].ToString().ToLower());

                c=1;

            }

        }

        Console.WriteLine("{0}",b);

    }

}