#include <iostream>

using namespace std;

int main() {
	int A[3], B[3];
	scanf("%d.%d.%d",&A[0],&A[1],&A[2]);
	scanf("%d.%d.%d",&B[0],&B[1],&B[2]);
	for(int i=0; i<3;i++) {
		if(A[i] < B[i]) {
			cout << "NO" << endl;
			return 0;
		}
		else if(A[i] > B[i]) {
			cout << "YES" << endl;
			return 0;
		}
	}
	cout << "YES" << endl;
	return 0;
}