import java.util.*;

public class Main {
	static Scanner sc = new Scanner(System.in);
	public static void main(String[] args) {
		String[] a = sc.next().split("\\.");
		String[] b = sc.next().split("\\.");
		int[] x = new int[3];
		int[] y = new int[3];
		for (int i=0; i<3; i++) {
			x[i] = Integer.parseInt(a[i]);
			y[i] = Integer.parseInt(b[i]);
		}

		long c = x[2] + x[1]*1000 + x[0]*1000000;
		long d = y[2] + y[1]*1000 + y[0]*1000000;
		System.out.println(c<d?"NO":"YES");
	}
}