#include<iostream>
#include<cstdio>
#include<string>
#include<algorithm>
using namespace std;

int main() {
	int A[3], B[3];
	scanf("%d.%d.%d", &A[0], &A[1], &A[2]);
	scanf("%d.%d.%d", &B[0], &B[1], &B[2]);
	
	string str = "YES";
	for (int i = 0; i < 3; i++)
	{
		if (A[i] < B[i])
		{
			str = "NO";
			break;
		}
		else if (A[i] > B[i])
		{
			break;
		}
	}
	cout << str << endl;

	return 0;
}