#include <bits/stdc++.h>
#define rep(i, a, n) for (int i = a; i < n; i++)
#define repr(i, a, n) for (int i = n - 1; i >= a; i--)
using namespace std;
using ll = long long;
using P = pair<int, int>;
template <typename T> void chmin(T &a, T b) { a = min(a, b); }
template <typename T> void chmax(T &a, T b) { a = max(a, b); }

vector<int> split(const string &s, char delim) {
  vector<int> elems;
  stringstream ss(s);
  string item;
  while (getline(ss, item, delim)) {
    if (!item.empty()) {
      elems.push_back(stoi(item));
    }
  }
  return elems;
}

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);

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

  if (a > d || (a == d && b > e) || (a == d && b == e && c >= f))
    cout << "YES" << endl;
  else
    cout << "NO" << endl;
}