// editor3
import java.util.*;

public class PalindromeString {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String N = sc.nextLine();
        if(N<0){
            System.out.println("Invalid input");
        }

        String rev = "";  
        for (int i = N.length() - 1; i >= 0; i--) {
            rev += N.charAt(i);
        }

        if (N.equals(rev)) {
            System.out.println("YES");
        } else {
            System.out.println("No");
        }
    }
}