#include <iostream>	//cin, cout
#include <vector>	//vector
#include <algorithm> //sort,min,max
#include <string>	//string
#include <ios>		//fixed
#include <iomanip>	//setprecision
#include <utility> //swap
#include <cstdlib>	//abs(int)
#include <cmath>	//sqrt
#include <sstream>	//stringstream,getline

using namespace std;

int main() {

	int a1, b1, c1;
	int a2, b2, c2;

	scanf("%d.%d.%d", &a1, &b1, &c1);
	scanf("%d.%d.%d", &a2, &b2, &c2);

	if (a2 <= a1) {
		if (b2 <= b1) {
			if (c2 <= c1) {
				cout << "YES" << endl;
				return 0;
			}
		}
	}

	cout << "NO" << endl;

	return 0;

}