#include <iostream>
#include <vector>
#include <algorithm>
#include <tuple>

#define REP(i, a, b) for (int i = int(a); i < int(b); i++)

using namespace std;

typedef long long int lli;

int main() {
    char dummy;
    int a, b, c;
    cin >> a >> dummy >> b >> dummy >> c;
    auto t1 = make_tuple(a, b, c);
    cin >> a >> dummy >> b >> dummy >> c;
    auto t2 = make_tuple(a, b, c);
    cout << (t1 >= t2 ? "YES" : "NO") << endl;
    return 0;
}