#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]);
	int valA = A[0]*10000 + A[1]*100 + A[2];
	int valB = B[0]*10000 + B[1]*100 + B[2];
	if(valA < valB)
		cout << "NO" << endl;
	else
		cout << "YES" << endl;
	return 0;
}