#include <iostream>
#include <vector>
#include <cstdio>
#include <sstream>
#include <map>
#include <string>
#include <algorithm>
#include <queue>
#include <cmath>
#include <set>
using namespace std;

int main(){
	vector<int> x(3);
	vector<int> y(3);

	scanf("%d.%d.%d", &x[0], &x[1], &x[2]);
	scanf("%d.%d.%d", &y[0], &y[1], &y[2]);

	cout << ((y<=x) ? "YES":"NO") << endl;

	return 0;
}