package me.yukicoder.lv1;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;

public class No0138 {
	public static void main(String[] args) {
		try (BufferedReader br = new BufferedReader(new InputStreamReader(System.in))) {
			String[] s1 = br.readLine().split("\\.");
			String[] s2 = br.readLine().split("\\.");
			int[][] v = new int[2][3];

			for (int i = 0; i < s1.length; i++) {
				v[0][i] = Integer.parseInt(s1[i]);
				v[1][i] = Integer.parseInt(s2[i]);
			}

			for (int j = 0; j < 3; j++) {
				if (v[0][j] > v[1][j]) {
					System.out.println("YES");
					break;
				} else if (v[0][j] < v[1][j]) {
					System.out.println("NO");
					break;
				} else if (j == 2 && v[0][j] == v[1][j]) {
					System.out.println("YES");
				}
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}