#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < n; ++i)
using ll = long long;
using namespace std;
const int INF = 1e9;

int main() {
    int a, b, c, d, e, f;
    scanf("%d.%d.%d", &a, &b, &c);
    scanf("%d.%d.%d", &d, &e, &f);

    if (a * 1000000 + b * 1000 + c > d * 1000000 + e * 1000 + f)
        cout << "YES";
    else
        cout << "NO";
    cout << endl;

    return 0;
}