#include <iostream>
#include <tuple>
#include <vector>

int main() {
    using namespace std;
    int n;
    cin >> n;
    vector<tuple<int, int, int, int, string>> res(n);
    for (auto &[a, b, c, d, r] : res) { cin >> a >> b >> c >> d >> r;}

    for (int x = 0; x < 10; x++) {
        bool ok = true;
        for (auto [a, b, c, d, r] : res) {
            if (x == a || x == b || x == c || x == d) {
                ok &= (r == "YES");
            } else {
                ok &= (r == "NO");
            }
        }
        if (ok) { cout << x << endl; }
    }
}