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

signed main(){
  int N; cin >> N;
  vector< int > cnt( 10 ), bye( 10 );
  for( int i = 0; i < N; ++i ){
    int A, B, C, D; string R; cin >> A >> B >> C >> D >> R;
    if( R == "NO" )
      ++bye[ A ], ++bye[ B ], ++bye[ C ], ++bye[ D ];
    ++cnt[ A ], ++cnt[ B ], ++cnt[ C ], ++cnt[ D ];
  }
  int maxc = -1, id = -1;
  for( int i = 0; i < 10; ++i )
    if( bye[ i ] == 0 )
      if( cnt[ i ] > maxc )
        maxc = cnt[ i ], id = i;
  cout << id << endl;
  return 0;
}