#include <bits/stdc++.h>
#define fastIO (cin.tie(0), cout.tie(0), ios::sync_with_stdio(false))
#define precise(i) fixed << setprecision(i)
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
using namespace std;

vector<string> convert(string version) {
  vector<string> temp;
  size_t prev = 0;
  for (size_t i = 0; i < version.size(); ++i) {
    if (version[i] == '.') {
      temp.emplace_back(version.substr(prev, i - prev));
      prev = ++i;
    }
  }
  temp.emplace_back(version.substr(prev));

  return temp;
}

int main() {
  fastIO;

  string f, c;
  cin >> f >> c;

  vector<string> f_ver = convert(f);
  vector<string> c_ver = convert(c);

  for (int i = 0; i < 3; ++i) {
    if (f_ver[i] > c_ver[i]) {
      cout << "YES" << '\n';
      return 0;
    } else if (f_ver[i] < c_ver[i]) {
      cout << "NO" << '\n';
      return 0;
    }
  }

  cout << "YES" << '\n';
  return 0;
}