using System;

public class Program

{

    public static void Main()

    {       

        String str = "ABCD EFGH Z";

        Console.WriteLine(str);

        string strReversed = "";

        for(int i = str.Length-1; i >=0; i--){

            strReversed += str[i];

        }

        Console.WriteLine(strReversed);     

    }

}