using System;

public class Program

{

    public static void Main()

    {

        string s0 = "Hello World";

        string s1 = "";

        int i1 = s0.Length;

        Console.WriteLine(s0);

        int i0 = 0;

        for (i0=i1; 1; -1)  

        {

            s1 = s1 + s0.Substring(i0,1);

        }

        Console.WriteLine(s1);

    }

}