import java.util.*;

public class Main1 {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String k = in.next();
        String n = in.next();
        if (k.compareTo(n) < 0) {
            System.out.println("NO");
        } else {
            System.out.println("YES");
        }
    }
}