#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define endl "\n"

int main() {
    int n;
    cin >> n;
    vector<int> ans(10, 0);
    int cnt = 0;
    for (int i = 0; i < n; ++i) {
        vector<int> a(4);
        string r;
        for (int i = 0; i < 4; ++i) {
            cin >> a[i];
        }
        cin >> r;
        if (r == "YES") {
            for (int i = 0; i < 4; ++i) {
                ans[a[i]]++;
            }
            cnt++;
        } else {
            for (int i = 0; i < 4; ++i) {
                ans[a[i]]--;
            }
        }
    }

    for (int i = 0; i < 10; ++i) {
        if (ans[i] == cnt) {
            cout << i << endl;
            break;
        }
    }
    return 0;
}