using System;

​

public class Program

{

    public static void Main()

    {

        int number;

        Console.WriteLine("Hello World");

        number = int.Parse(Console.ReadLine());

        if (number > 9 && number < 100)

            if (number / 10 == number % 10)

                Console.WriteLine("palindrom");

            else

                Console.WriteLine("not palindrom");

        else

            Console.WriteLine("not a two digit number");

    }

}