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");
}