#include<iostream>
#include<set>
#include<cstring>
using namespace std;
const int N=2e5+8;
set<string>tm[30];
int main()
{
	cin.tie(0)->sync_with_stdio(false);
	int t;cin>>t;
	while(t--)
	{
		int n;cin>>n;
		int res=0;
		for(int i=1;i<=30;i++ )	tm[i].clear();
		for(int i=1;i<=n;i++ )
		{
			string  s;cin>>s;
			char x;cin>>x;
			string  rt;cin>>rt;
			if(rt=="accepted")	tm[x-'A'].insert(s);
		}
		for(int i=1;i<=30;i++)
		{
			if(tm[i].size()>tm[res].size())res=i;
		}
		printf("%c\n",res+'A');
	}
	return 0;
}