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

int main()
{
    int a, b, c, d, e, f;
    scanf("%d.%d.%d%d.%d.%d", &a, &b, &c, &d, &e, &f);
    cout << (a < d || (a == d && b < e) || (a == d && b == e && c < f) ? "NO" : "YES") << endl;
}