#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;

inline std::vector<std::string> Split_String(const std::string& str, const char key) {

	std::vector<std::string> result;
	std::stringstream SS(str);
	std::string temp;

	while (std::getline(SS, temp, key)) {
		result.push_back(temp);
	}

	return(result);

}

int main() {

	vector<string> A, B;
	string temp;

	cin >> temp;
	A = Split_String(temp, '.');

	cin >> temp;
	B = Split_String(temp, '.');

	int a1 = stoi(A[0]), b1 = stoi(A[1]), c1 = stoi(A[2]);
	int a2 = stoi(B[0]), b2 = stoi(B[1]), c2 = stoi(B[2]);

	bool flg = true;

	if (a2 > a1) {
		flg = false;
	}
	else if (a2 == a1) {
		if (b2 > b1) {
			flg = false;
		}
		else if (b2 == b1) {
			if (c2 > c1) {
				flg = false;
			}
		}
	}

	if (flg) {
		cout << "YES" << endl;
	}
	else {
		cout << "NO" << endl;
	}

	return 0;

}