#include <iostream>

int main(){
	int p[2];
	for (int i = 0; i < 2; ++i){
		int a, b, c;
		char ch;
		std::cin >> a >> ch >> b >> ch >> c;
		p[i] = c + b * 10 + a * 100;
	}
	if (p[1] <= p[0])std::cout << "YES" << std::endl;
	else std::cout << "NO" << std::endl;
	return 0;
}