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

int main() {
  string S, T; cin >> S >> T;
  if(S == T) cout << "YES" << endl;
  else{
    int s = stoi(S.substr(0,1));
    int t = stoi(T.substr(0,1));
    if(s != t){
      if(s < t) cout << "NO" << endl;
      else cout << "YES" << endl;
    }else{
      s = stoi(S.substr(2,3));
      t = stoi(T.substr(2,3));
      if(s != t){
        if(s < t) cout << "NO" << endl;
        else cout << "YES" << endl;
      }else{
        s = stoi(S.substr(4,5));
        t = stoi(T.substr(4,5));
        if(s < t) cout << "NO" << endl;
        else cout << "YES" << endl;
      }
    }
  }
}