#include<bits/stdc++.h>
using namespace std;
#define int long long

void solve()
{
	int n;
	cin >> n;
	vector<string> v(30);
	map<string, int> m;
	for (int i = 0; i < n; i++)
	{
		string t, p, s;
		cin >> t >> p >> s;
		if (s == "accepted" && v[t[4] - 'A'].find(p[0]) == -1) // t队的p题还没AC
		{
			m[p]++;
			v[t[4] - 'A'].push_back(p[0]);
		}
	}
	int maxn = -1;
	string ans;
	for (auto i : m)
	{
		if (maxn < i.second)
		{
			maxn = i.second;
			ans = i.first;
		}
	}
	cout << ans << endl;
}

signed main()
{
	ios::sync_with_stdio(false);
	cin.tie(0), cout.tie(0);

	int T = 1;
	cin >> T;
	while (T--)
	{
		solve();
	}

	return 0;
}