using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("enter 5 digit number");

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

        int righttwo = nmber%100;

        int lefttwo = nmber/1000;

        //Console.WriteLine(lefttwo);

        //Console.WriteLine(righttwo);

        if (lefttwo==righttwo)

            Console.WriteLine("yes");

        else

            Console.WriteLine("no");

    }

}