import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        final Scanner scanner = new Scanner(System.in);
        final String in = scanner.nextLine();
        final int length = in.length();
        int j = length - 1;
        for (int i = 0; i < length; i++) {
            if (in.charAt(i) != in.charAt(j)) {
                System.out.println("no");
                return;
            }
            j--;
        }
        System.out.println("yes");
    }
}