#include<cstdio>
#include <iostream>
#include<algorithm>
#include<string>
#include<queue>
#include<vector>
#include<functional>
#include<cmath>
#include<map>
#include<stack>
#include<set>
#include<numeric>

using namespace std;
typedef long long ll;
typedef pair<int, int> Pr;

int A0, B0, C0, A1, B1, C1;

int main()
{
	scanf("%d.%d.%d",&A0,&B0,&C0);
	scanf("%d.%d.%d", &A1, &B1, &C1);

	int num1 = A0 * 100000 + B0 * 1000+ C0;
	int num2 = A1 * 100000 + B1 * 1000 + C1;

	if (num1 >= num2)cout << "YES" << endl;
	else cout << "NO" << endl;
	return 0;
}