#include <iostream>
using namespace std;
const int n = 3;
int A[n], B[n];
bool flg = false;

void RecursiveJudge(int i)
{
	int a = A[i], b = B[i];
	if (i != n || a > b)
	{
		cout << "YES" << endl;
		return;
	}
	if (a < b)
	{
		cout << "NO" << endl;
		return;
	}
	RecursiveJudge(i + 1);
}

int main()
{
	scanf("%d.%d.%d", &A[0], &A[1], &A[2]);
	scanf("%d.%d.%d", &B[0], &B[1], &B[2]);

	RecursiveJudge(0);
}