#include<bits/stdc++.h>
using namespace std;
typedef pair<string,pair<char,bool>> ppp;
void sol(){
	int n;
	cin >> n;
	vector<ppp> a(n);
	vector<int> cnt(26);
	for(int i = 0 ; i < n ; ++i){
		string t;
		cin >> a[i].first >> a[i].second.first >> t;
		if(t == "accepted")a[i].second.second = true;
		else a[i].second.second = false;
	}
	sort(a.begin(),a.end());
	a.erase(unique(a.begin(),a.end()),a.end());
	int ans = 0;
	for(auto s:a){
		if(s.second.second){
			int k = s.second.first - 'A';
			cnt[k]++;
			if(cnt[ans] < cnt[k])ans = k;
		}
	}
	cout << char(ans+'A') << endl;
}
int main(){
	ios::sync_with_stdio(false);
	cin.tie(nullptr);cout.tie(nullptr);
	int t;
	cin >> t;
	while(t--)sol();
	return 0;
}