#include <bits/stdc++.h>
using namespace std;

int main()
{
	string S0, S1;
	cin >> S0 >> S1;

	int a0, b0, c0, a1, b1, c1;
	sscanf( S0.c_str(), "%d.%d.%d", &a0, &b0, &c0 );
	sscanf( S1.c_str(), "%d.%d.%d", &a1, &b1, &c1 );
	string ans = "NO";
	if( a0 * (100 * 100 + 1) + b0 * (100 + 1) + c0 >= a1 * (100 * 100 + 1) + b1 * (100 + 1) + c1 ) ans = "YES";

	cout << ans << endl;
}