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

int main(){
  vector<int> old(3), now(3);
  
  scanf("%d.%d.%d", &old[0], &old[1], &old[2]);
  scanf("%d.%d.%d", &now[0], &now[1], &now[2]);
  
  if(now <= old){
    cout << "YES" << endl;
  } else {
    cout << "NO" << endl;
  }
  
  return 0;
}