using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

         String cad="";    

   Console.WriteLine("ingresa una palabra");

   String pal = Console.ReadLine();

   int t = pal.Length;

    for(int i=t-1;i>=0;i--){

        cad=cad+pal.Substring(i, 1);

    }

    Console.WriteLine(cad);               

           Console.ReadLine();

    }

}