#include<iostream>
#include<string>
#include<vector>

using namespace std;

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

	int A, B, C, D;
	string R;

	vector<int>check(10, 0);
	for (int j = 0; j < N; j++){
		cin >> A >> B >> C >> D >> R;
		if (R == "NO"){
			for (int i = 0; i < 10; i++){
				if (i == A || i == B || i == C || i == D)
					check[i]++;
			}
		}
		else if (R == "YES"){
			for (int i = 0; i < 10; i++){
				if (i != A && i != B && i != C && i != D)
					check[i]++;
			}
		}
	}
	for (int i = 0; i < 10; i++){
		if (check[i] == 0){
			cout << i << endl;
			break;
		}
	}
}