using System;

public class Program

{

    public static void Main()

    {

        string s = Console.ReadLine();

            s = Without_(s);

            string s1 = Reverse(s);

            if (s1 == s) Console.WriteLine("yes");

            else Console.WriteLine("no");

        }

        static string Without_(string s)

        {

            string s1 = "";

            for (int i = 0; i < s.Length; i++)

            {

                if (s[i] != ' ') s1 += s[i];

            }

            return s1;

        }

        static string Reverse(string s)

        {

            string s1 = "";

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

                s1 = s1 + s[i];

            return s1;

        }

    }