#include<iostream>
#include<unordered_map>
using namespace std;

int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int t;
    cin >> t;
    while (t--) {
        unordered_map <string, int[26]> mp;//队名
        int co[26] = { 0 };
        int k;
        cin >> k;
        for (int i = 0; i < k; i++) {
            string team, answer;
            char qus;
            cin >> team >> qus >> answer;
            if (answer == "accepted") {
                if (mp[team][qus - 'A']) continue;
                co[qus - 'A']++;
            }
        }
        int maxx = -1; char maxname;
        for (int i = 0; i < 26; i++)
            if (maxx < co[i]) {
                maxx = co[i];
                maxname = i + 'A';
            }

        cout << maxname << '\n';
    }
    return 0;
}