#include <iostream>
#include <string>
#include <bitset>
#include <vector>
#include <cmath>

using namespace std;

int main() {
    int n, m;
    unsigned long long ans;
    string s;
    bitset<10> bitcheck, bittemp;
    bitcheck.set();
    vector<int> vec;

    cin >>n;

    for (int i = 0; i < n; ++i) {
        for (int j = 0; j < 4; ++j) {
            cin >> m;
            vec.push_back(m);
        }
        cin >> s;
        if (s == "YES") {
            for (size_t k = 0; k < vec.size(); ++k) {
                bittemp.set(vec.at(k));
            }
        } else if (s == "NO") {
            for (size_t k = 0; k <vec.size(); ++k) {
                bittemp.set(vec.at(k));
            }
            bittemp.flip();

        }

        bitcheck &= bittemp;
        bittemp.reset();
        vec.clear();
    }
    ans = static_cast<unsigned long long>(log2(bitcheck.to_ullong()));
    cout << ans << endl;
    return 0;
}