#include <iostream>
#include <algorithm>
#include <string>
#include <vector>
#include <map>
#include <set>
#include <stdio.h>
#include <cstring>
#include <queue>
#include <stack>
#include <functional>
#include <math.h>
#include <iomanip>
using namespace std;
#define Would
#define you
const int INF = 999999999;
const int MOD = 1e9 + 7;
const double pi = 3.141592653589793238;

int main() {
	int a, b, c, d, e, f;
	scanf("%d.%d.%d", &a, &b, &c);
	scanf("%d.%d.%d", &d, &e, &f);
	if (a > d) {
		cout << "YES" << endl;
		return 0;
	}
	else if (d > a) {
		cout << "NO" << endl;
		return 0;
	}
	if (b > e) {
		cout << "YES" << endl;
		return 0;
	}
	else if (e > b) {
		cout << "NO" << endl;
		return 0;
	}
	if (c > f) {
		cout << "YES" << endl;
		return 0;
	}
	else if (f > c) {
		cout << "NO" << endl;
		return 0;
	}
	cout << "YES" << endl;
	return 0;
}