#include <iostream>
#include <list>
#include <vector>
#include <string>
#include <stdio.h>
#include <stdint.h>
using namespace std;

using uint = unsigned int;
using ll = long long;

int main()
{

  ll N;
  cin >> N;

  ll must_false[10] = {};
  ll A , B , C , D;
  string R;
  
  for( ll i = 0 ; i < N ; i++ ){

    cin >> A;
    cin >> B;
    cin >> C;
    cin >> D;
    cin >> R;

    for( ll j = 0 ; j < 10 ; j++ ){

      ll& f = must_false[j];

      if( f == 0 ){

	const bool b = j != A && j != B && j != C && j != D;

	if( ( R == "YES" ) == b ){

	  f = 1;

	}

      }

    }
    
  }

  for( ll j = 0 ; j < 10 ; j++ ){

    if( must_false[j] == 0 ){

      cout << j << endl;
      j = 10;

    }
    
  }
  
  return 0;

}