using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

    static string Ins(string S)

    {

        return Ins(S);

    }

    static string Ins1(string S, int index, int cntr)

    {

        if (index == S.Length)return " ";

        if (cntr == 3)

            return S[index] +"*"+ Ins1(S, index+1, cntr+1);

        else

            return S[index] + Ins1(S, index+1, cntr+1);

    }

}