#include <bits/stdc++.h>
using namespace std;
int main(){
  int A0, B0, C0;
  char c00, c01;
  cin >> A0 >> c00 >> B0 >> c01 >> C0;
  int A1, B1, C1;
  char c10, c11;
  cin >> A1 >> c10 >> B1 >> c11 >> C1;
  vector<int> V1 = {A0, B0, C0};
  vector<int> V2 = {A1, B1, C1};
  if (V2 <= V1){
    cout << "YES" << endl;
  } else {
    cout << "NO" << endl;
  }
}