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

int main()
{
char S[ 20 ];
char T[ 20 ];

	cin >> S;
	cin >> T;

	do
	{
		if( S[ 0 ] < T[ 0 ] ) break;
		if( S[ 2 ] < T[ 2 ] ) break;
		if( S[ 4 ] < T[ 4 ] ) break;

		cout << "YES" << endl;

		return 0;
	}
	while( false );

	cout << "NO" << endl;

	return 0;
}