using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Polyndrom
{
    class Program
    {
        static void Main(string[] args)
        {
            string s=Console.ReadLine();
            char[] s1 = s.ToCharArray();
            if (s1.SequenceEqual(s1.Reverse())) { Console.WriteLine("YES"); }
            else {Console.WriteLine("NO");}            
        }
    }
}