class Version {
	int[] num = new int[3];

	static boolean checkVersion(int[] num1, int[] num2, int i) {
		if (i > 2 || num1[i] > num2[i]) {
			return true;
		} else if (num1[i] < num2[i]) {
			return false;
		} else {
			return checkVersion(num1, num2, ++i);
		}
	}

}

public class No_138 {

	public static void main(String[] args) {
		java.util.Scanner sc = new java.util.Scanner(System.in);
		String[] s1 = sc.nextLine().split("\\.");
		String[] s2 = sc.nextLine().split("\\.");

		Version old = new Version();
		Version set = new Version();

		for (int i = 0; i < 3; i++) {
			old.num[i] = Integer.parseInt(s1[i]);
			set.num[i] = Integer.parseInt(s2[i]);
		}

		if (Version.checkVersion(old.num, set.num, 0)) {
			System.out.println("YES");
		} else {
			System.out.println("NO");
		}
	}

}