using System;
using System.Collections.Generic;
using System.Linq;

namespace Cybo
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine(ping(1000000));
            Console.ReadKey();
        }

        private static string ping(int p)
        {
            return p > 0 ? pong(p - 1) : "ping";
        }

        private static string pong(int p)
        {
            return p > 0 ? ping(p - 1) : "pong";
        }

    }
}