import java.util.*;
class Yukico138 {
	public static void main(String[] args) {
		Scanner stdio = new Scanner(System.in);
		String s0 = stdio.next();
		String s1 = stdio.next();
		String[] ver0 = new String[3];
		String[] ver1 = new String[3];
		ver0 = s0.split("[.]");
		ver1 = s1.split("[.]");
		boolean yes = true;
		for(int i=0; i<3; i++) {
			if(Integer.parseInt(ver0[i]) == Integer.parseInt(ver1[i])) {
				continue;
			}else if(Integer.parseInt(ver0[i]) < Integer.parseInt(ver1[i])) {
				yes = false;
				break;
			}else {
				break;
			}
		}
		if(yes) {
			System.out.println("YES");
		} else {
			System.out.println("NO");
		}
	}
}