#include <iostream>

using namespace std;

int main()
{
	int A0, B0, C0;
	int A1, B1, C1;
	
	scanf( "%d.%d.%d\n", &A0, &B0, &C0 );
	scanf( "%d.%d.%d\n", &A1, &B1, &C1 );
	
	if( A0 > A1 ) {
		cout << "YES" << endl;
		return 0;
	}
	if( A0 < A1 ) {
		cout << "NO" << endl;
		return 0;
	}
	if( B0 > B1 ) {
		cout << "YES" << endl;
		return 0;
	}
	if( B0 < B1 ) {
		cout << "NO" << endl;
		return 0;
	}
	if( C0 >= C1 ) {
		cout << "YES" << endl;
		return 0;
	}
	if( C0 < C1 ) {
		cout << "NO" << endl;
		return 0;
	}

	return 0;
}