import java.util.*;

class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String[] v1 = in.next().split("\\.");
        String[] v2 = in.next().split("\\.");

        String ans = "NO";
        for(int i = 0; i < 3; i++) {
            int k = Integer.parseInt(v1[i]);
            int t = Integer.parseInt(v2[i]);
            if(i == 0) {
                if(k > t) {
                    ans = "YES";
                    break;
                } else {
                    if(i == 1) {
                        if(k > t) {
                            ans = "YES";
                            break;
                        } else {
                            if(i == 2) {
                                if(k > t) {
                                    ans = "YES";
                                    break;
                                }
                            }
                        }
                    }
                }
            }
        }

        System.out.println(ans);
    }
}