#include <iostream>
#include <vector>
using namespace std;

int N;
vector<int> A, B, C, D;
vector<string> R;

void Solve() {
    vector<bool> is_survived = vector<bool>(10, true);
    for (int i = 0; i < N; i++) {
        for (int j = 0; j < 10; j++) {
            if (R[i] == "YES" && A[i] != j && B[i] != j && C[i] != j && D[i] != j) {
                is_survived[j] = false;
            }
            if (R[i] == "NO" && (A[i] == j || B[i] == j || C[i] == j || D[i] == j)) {
                is_survived[j] = false;
            }
        }
    }

    for (int i = 0; i < 10; i++) {
        if (is_survived[i]) {
            cout << i << endl;
            return;
        }
    }
}

int main() {
    cin >> N;

    A = vector<int>(N);
    B = vector<int>(N);
    C = vector<int>(N);
    D = vector<int>(N);
    R = vector<string>(N);

    for (int i = 0; i < N; i++) {
        cin >> A[i] >> B[i] >> C[i] >> D[i] >> R[i];
    }

    Solve();

    return 0;
}