// No.24 数当てゲーム
// https://yukicoder.me/problems/no/24
//

#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <utility>
using namespace std;

int solve(vector<pair<vector<int>, string>>& guess);


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

    vector<pair<vector<int>, string>> guess;
    int A, B, C, D;
    string R;
    for (auto i = 0; i < N; i++) {
        vector<int> numbers(4);
        cin >> numbers[0] >> numbers[1] >> numbers[2] >> numbers[3];
        cin >> R;
        sort(numbers.begin(), numbers.end());
        guess.push_back(make_pair(numbers, R));
    }

    int ans = solve(guess);
    cout << ans << endl;
}

int solve(vector<pair<vector<int>, string>>& guess) {
    vector<int> p {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};

    for (auto g: guess) {
        vector<int> res;
        if (g.second == "YES") {
            set_intersection(p.begin(), p.end(), g.first.begin(), g.first.end(), inserter(res, res.end()));
            p.swap(res);
        } else {
            vector<int> q {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
            q.erase(q.begin() + g.first[3]);
            q.erase(q.begin() + g.first[2]);
            q.erase(q.begin() + g.first[1]);
            q.erase(q.begin() + g.first[0]);
            set_intersection(p.begin(), p.end(), q.begin(), q.end(), inserter(res, res.end()));
            p.swap(res);
        }
    }
    return p[0];
}