import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.stream.Stream;

import static java.lang.System.in;

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(in));
        String[] S = reader.readLine().split("\\.");
        String[] M = reader.readLine().split("\\.");

        int[] possibleOldVersion = Stream.of(S).mapToInt(Integer::parseInt).toArray();
        int[] targetVersion = Stream.of(M).mapToInt(Integer::parseInt).toArray();

        for (int i = 0; i < 3; i++) {

            if (possibleOldVersion[i] < targetVersion[i]) {
                System.out.println("NO");
                break;
            } else if (possibleOldVersion[i] == targetVersion[i]) {
                if (i==2) {
                    System.out.println("YES");
                }
            } else {

                System.out.println("YES");
                break;
            }
        }
    }
}