#include<bits/stdc++.h>
using namespace std;
unordered_map <string, int> mp;//队名
unordered_map <char,int> co;
int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int t;
    cin >> t;
    while (t--) {
        co.clear();mp.clear();
        int k;
        cin >> k;
        for (int i = 0; i < k; k++) {
            string team, answer;
            char qus;
            cin >> team >> qus >> answer;
            if (answer == "accepted") {
                if (mp[team] >>(qus-'A') &1) continue;

                mp[team]|=1<<(qus-'A');
                co[qus]++;
            }
        }
        int maxx = -1;char maxname;
        for(auto &ele:co){
            if(maxx<ele.second ||(maxx==ele.second && maxname<ele.first)) {
                maxx=ele.second;maxname=ele.first;
            }
        }
       cout<<maxname<<'\n';
    }
    return 0;
}