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

using namespace std;

class Kazuate{
	int A, B, C, D, N;
	string R;
	int check[10];

public:
	Kazuate() :A(0), B(0), C(0), D(0), N(0), R("NONE")
	{
		for (int i = 0; i < 10; i++) check[i] = 0;
	}

	Kazuate(const Kazuate& t)
	{
		A = t.A;
		B = t.B;
		C = t.C;
		D = t.D;
		N = t.N;
		R = t.R;
	}

	int getA(){ return A; }
	int getB(){ return B; }
	int getC(){ return C; }
	int getD(){ return D; }
	int getN(){ return N; }
	string getR(){ return R; }

	void setData()
	{
		cin >> A >> B >> C >> D >> R;
	}

	void checker()
	{
		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]++;
			}
		}
	}

	void LoopFrame()
	{
		cin >> N;
		for (int i = 0; i < N; i++){
			setData();
			checker();
		}
	}

	void putAnswer()
	{
		for (int i = 0; i < 10; i++){
			if (check[i] == 0){
				cout << i << endl;
				break;
			}
		}
	}
};

int main()
{
	Kazuate x;

	x.LoopFrame();

	x.putAnswer();
}