#include <bits/stdc++.h>
#define endl '\n'
#define int long long
using namespace std;
 
void solve()
{
	int n;
	cin >> n;
	map<char,int> mp;
	for (int i = 0 ; i < n ; ++i){
		string s1,s2;
		char x;
		cin >> s1;
		cin >> x;
		cin >> s2;
		if (s2 == "accepted") mp[x]++; 
	}
	int max = 0;
	char ans = 'A'-1;
	for (auto& i: mp){
		if (i.second > max && i.first > ans){
			max = i.second;
			ans = i.first;
		}
	}
	cout << ans << endl;
}
 
 
signed main()
{
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	int t=1;
	cin>>t;
	while(t--){
	solve();
	}
	return 0;
 }