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

using namespace std;

void checker(vector<int>& c, int AA, int BB, int CC, int DD, string RR)
{
	if (RR == "NO"){
		for (int i = 0; i < 10; i++){
			if (i == AA || i == BB || i == CC || i == DD)
				c[i]++;
		}
	}
	else if (RR == "YES"){
		for (int i = 0; i < 10; i++){
			if (!(i == AA || i == BB || i == CC || i == DD))
				c[i]++;
		}
	}
}

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;

		checker(check, A, B, C, D, R);
	}
	for (int i = 0; i < 10; i++){
		if (check[i] == 0){
			cout << i << endl;
			break;
		}
	}
}