#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
  #define _GLIBCXX_DEBUG
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

int main() {
  tuple<int, int, int> a, b;
  scanf("%d.%d.%d", &get<0>(a), &get<1>(a), &get<2>(a));
  scanf("%d.%d.%d", &get<0>(b), &get<1>(b), &get<2>(b));
  if (b <= a) {
    cout << "YES" << endl;
  }
  else {
    cout << "NO" << endl;
  }
  return 0;
}