#include <iostream>
#include <set>

using namespace std;

int N;

int main() {
    set<int> s;
    for (int i = 0; i < 10; i++) s.insert(i);
    cin >> N;
    for (int i = 0; i < N; i++) {
        int a[4];
        string r;
        for (int j = 0; j < 4; j++) {
            cin >> a[j];
        }
        cin >> r;
        if (r == "YES") {
            for (int j = 0; j < 10; j++) {
                bool exist = false;
                for (int k = 0; k < 4; k++) {
                    if (a[k] == j) {
                        exist = true;
                        break;
                    }
                }
                if (exist) continue;
                s.erase(j);
            }
        } else {
            for (int j = 0; j < 4; j++) {
                s.erase(a[j]);
            }
        }
    }
    cout << *s.begin() << endl;
    return 0;
}