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

int main() {
	int N;
	cin >> N;

	vector<int> v(10, 0);
	int y = 0;
	for (int i = 0; i < N; i++) {
		int A, B, C, D;
		string R;
		cin >> A >> B >> C >> D >> R;
		int& a = v.at(A),
			& b = v.at(B),
			& c = v.at(C),
			& d = v.at(D);

		if (R == "NO") {
			a = -1;
			b = -1;
			c = -1;
			d = -1;
		}
		else {
			y++;
			if (a != -1) a++;
			if (b != -1) b++;
			if (c != -1) c++;
			if (d != -1) d++;
		}
		/*
		for (int j = 0; j < 10; j++) {
			cout << v.at(j);
			if (j == 9) {
				cout << endl;
			}
			else {
				cout << ' ';
			}
		}*/
	}
	//cout << "y;" << y << endl;

	int f = -1;
	for (int i = 0; i < 10; i++) {
		if (v.at(i) == y) {
			f = i;
		}
	}
	if (f == -1) {
		for (int i = 0; i < 10; i++) {
			if (v.at(i) == -1) {
				f = i;
			}
		}
	}

	cout << f << endl;
}