import java.util.Scanner;

public class Test {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		int n = 0, m = 0;
		String[] s = sc.next().split("\\.");
		for (int i = 0; i < 3; i++) {
			n *= 1000;
			n += Integer.parseInt(s[i]);
		}
		s = sc.next().split("\\.");
		for (int i = 0; i < 3; i++) {
			m *= 1000;
			m += Integer.parseInt(s[i]);
		}
		if (n < m) {
			System.out.println("NO");
		} else {
			System.out.println("YES");
		}
	}
}