#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);

  string one, two;
  cin >> one >> two;
  vector<int> v1 = split(one, '.'), v2 = split(two, '.');
  string ans = "NO";
  if (v1[0] > v2[0])
    ans = "YES";
  else if (v1[0] == v2[0]) {
    if (v1[1] > v2[1])
      ans = "YES";
    else if (v1[1] == v2[1] && v1[2] >= v2[2])
      ans = "YES";
  }
  cout << ans << endl;
}