#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

int main() {
  string one, two;
  cin >> one >> two;
  int a = one[0] - '0', b = one[2] - '0', c = one[4] - '0';
  int aa = two[0] - '0', bb = two[2] - '0', cc = two[4] - '0';
  if (aa < a || (aa <= a && bb < b) || (aa <= a && bb <= b && cc < c)) puts("YES");
  else puts("NO");
  return 0;
}