#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i, n) for(ll i = 0, i##_len = (n); i < i##_len; i++)
#define reps(i, s, n) for(ll i = (s), i##_len = (n); i < i##_len; i++)
#define rrep(i, n) for(ll i = (n) - 1; i >= 0; i--)
#define rreps(i, e, n) for(ll i = (n) - 1; i >= (e); i--)
#define all(x) (x).begin(), (x).end()
#define sz(x) ((ll)(x).size())
#define len(x) ((ll)(x).length())

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    // ifstream in("input.txt");
    // cin.rdbuf(in.rdbuf());
    ll n;
    cin >> n;
    vector<bool> kh(10, true);
    rep(i, n) {
        set<ll> a;
        rep(ii, 4) {
            ll tmp;
            cin >> tmp;
            a.insert(tmp);
        }
        string r;
        cin >> r;
        if (r == "YES") {
            rep(iii, 10) {
                if (a.count(iii) == 0) {
                    kh[iii] = false;
                }
            }
        }
        else {
            rep(iii, 10) {
                if (a.count(iii) > 0) {
                    kh[iii] = false;
                }
            }
        }
    }
    ll ans = 0;
    rep(i, 10) {
        if (kh[i]) ans = i;
    }
    cout << ans << endl;
    return 0;
}