#include <iostream>

using namespace std;
int main()
{
	int a[6];
	char c;
	cin >> a[0] >> c >> a[1] >> c >> a[2];
	cin >> a[3] >> c >> a[4] >> c >> a[5];

	if (a[0] * 10201 + a[1] * 101 + a[2] >= a[3] * 10201 + a[4] * 101 + a[5])
	{
		cout << "YES" << endl;
	}

	else cout << "NO" << endl;

	return 0;
}