#define  _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <algorithm>
#include <utility>
#include <functional>
#include <cstring>
#include <queue>
#include <stack>
#include <math.h>
#include <iterator>
#include <vector>
#include <string>
#include <set>
#include <math.h>
#include <iostream>
#include <random>
#include<map>
#include <fstream>
#include <iomanip>
#include <time.h>
#include <stdlib.h>
#include <list>
#include <typeinfo>
#include <list>
#include <set>
#include <assert.h>
using namespace std;
#define eps 0.000000001
#define LONG_INF 10000000000000000
#define GOLD 1.61803398874989484820458
#define MAX_MOD 1000000007
#define MOD 998244353
#define seg_size 65536*2
#define REP(i,n) for(long long i = 0;i < n;++i)
#define cycle_per_sec 2806192512
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) {
		if (a < d) {
			cout << "NO" << endl;
		}
		else {
			if (b <= e) {
				if (b < e) cout << "NO" << endl;
				else {
					if (c >= f) {
						cout << "YES" << endl;
					}
					else cout << "NO" << endl;
				}
			}
			else cout << "YES" << endl;
		}
	}
	else cout << "YES" << endl;
	return 0;
}