#define _USE_MATH_DEFINES	//M_PI
#include <iostream>			//std::cout, std::cin
#include <string>			//std::string
#include <vector>			//std::vector
#include <valarray>			//std::valarray	数値のみの一次配列
#include <algorithm>		//std::sort
#include <time.h>			//localtime_s
#include <cstdlib>			//abs
#include <cmath>			//abs, std::pow, sqrt, sin, cos,
#include <fstream>			//std::ifstream
#include <iomanip>			//std::setprecision
#include <random>			//std::random(C++11)
#include <numeric>			//std::accumulate

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

	std::string original = *str;
	std::string temp;

	while (!original.empty()) {
		if (original[0] == key) {
			if (!temp.empty()) {
				result.push_back(temp);
				temp.clear();
			}
		}
		else {
			temp.push_back(original[0]);
		}
		original.erase(original.begin());
	}

	if (!temp.empty()) {
		result.push_back(temp);
	}

}
int main(void) {

	//test用
	//std::ifstream in("test.txt");
	//std::cin.rdbuf(in.rdbuf());

	std::string str1, str2;
	std::cin >> str1 >> str2;

	std::vector<std::string> result1, result2;

	Split_String(&str1, '.', result1);
	Split_String(&str2, '.', result2);

	int i = 0;
	while (i<3 && std::stoi(result1[i]) == std::stoi(result2[i])) {
		i++;
	}

	if (i == 3 || std::stoi(result1[i]) > std::stoi(result2[i])) {
		std::cout << "YES" << std::endl;
	}
	else {
		std::cout << "NO" << std::endl;
	}

}