//Normal

#define _GLIBCXX_DEBUG
#define ll long long
#include <bits/stdc++.h>
using namespace std;
using Graph = vector<vector<int>>;

void print(auto a){
  cout << a;
}

void prints(auto a){
  cout << a << " ";
}

void prints(){
  cout << " ";
}

void printl(auto a){
  cout << a << endl;
}

void printl(){
  cout << endl;
}

void fix(int n){
  cout << fixed << setprecision(n);
}

int main(){
  string S, T; cin >> S >> T;
  int A0, B0, C0, A1, B1, C1;
  A0 = (int)S[0];
  B0 = (int)S[2];
  C0 = (int)S[4];
  A1 = (int)T[0];
  B1 = (int)T[2];
  C1 = (int)T[4];
  
  bool flag = false;
  if(A0 > A1) flag = true;
  else if(A0 == A1){
    if(B0 > B1) flag = true;
    else if(B0 == B1){
      if(C0 >= C1) flag = true;
    }
  }
  
  flag ? printl("YES") : printl("NO");
  
  return 0;
}