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

int main()
{
	int N;
	cin >> N;
	vector<int> y( 10 );
	vector<int> n( 10 );
	int ycnt = 0;
	for( int i = 0; i < N; i++ ) {
		int A, B, C, D;
		string R;
		cin >> A >> B >> C >> D >> R;
		if( R == "YES" ) {
			y[A]++;
			y[B]++;
			y[C]++;
			y[D]++;
			ycnt++;
		}
		else {
			n[A] = 1;
			n[B] = 1;
			n[C] = 1;
			n[D] = 1;
		}
	}

	int ans = 0;
	if( ycnt == 0 ) {
		for( int i = 0; i < 10; i++ ) {
			if( n[i] == 0 ) ans = i;
		}
	}
	else {
		for( int i = 0; i < 10; i++ ) {
			if( n[i] ) continue;
			if( y[i] == ycnt ) ans = i;
		}
	}

	cout << ans << endl;
}