#include <bits/stdc++.h>
using namespace std;
int main(){
  cin.tie(nullptr)->sync_with_stdio(false);
  int N; cin >> N;
  int ans = 1023;
  for(int i = 0; i < N; ++i){
    int a, b, c, d; 
    cin >> a >> b >> c >> d;
    string response; cin >> response;
    int mask = (1 << a) | (1 << b) | (1 << c) | (1 << d);
    if(response == "NO"){
      ans &= ~mask;
    } else{
      ans &= mask;
    }
  }
  assert(__builtin_popcount(ans) == 1);
  cout << __lg(ans) << endl;
  return 0;
}