using System;

public class Program

{

    public static void Main()

    {

        string x = Console.ReadLine();      

        string x1 ="";

        for(int i = x.Length-1 ; i >= 0; i--)

        {

            x1 += x[i];

        }

        //if(x1 == x)

        //Console.WriteLine("Yes");

        //else

        //Console.WriteLine("No");

        bool check = (x1 == x);

        string res = (check==true)? "YES": "NO";

        Console.WriteLine(res);

    }

}