import java.util.Scanner;

class No_138 {
	public static void main(String args[]) {
		Scanner stdIn = new Scanner(System.in);		

		String[] old_ver = stdIn.next().split("\\.");
		String[] ver = stdIn.next().split("\\.");

		int count = 0;
		boolean flag = true;
		for (int i = 0; i < 3; i++) {
			if (Integer.parseInt(old_ver[i]) > Integer.parseInt(ver[i])) {
				if ( flag ) {
					System.out.println("YES");	
					System.exit(0);
				}
			} else if (Integer.parseInt(old_ver[i]) != Integer.parseInt(ver[i])){
				flag = false;
			} else if (Integer.parseInt(old_ver[i]) == Integer.parseInt(ver[i])) {
                                count++;
				if ( count == 3 ) {
					System.out.println("YES");
					System.exit(0);
				}
			}
		}
		System.out.println("NO");
	}
}