7.2.9

import java.util.Scanner;
public class Main {


    static boolean  Palindrom(String a)
    {
        for(int i=0,Length=a.length(),j=(a.length()-1);i<j;i++,j--)
        {
            if (a.charAt(i)!=a.charAt(j)) return false;
        }
        return true;
    }

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String a=in.nextLine();
        if (Palindrom(a)) System.out.print("YES");
            else System.out.print("NO");
    }
}