#include<iostream>
#include<map>
#include<string.h>
#include<utility>
#include<set>
using namespace std;
int t,n;
string s1[100005];
char s2[2][15]={"accepted"," rejected"},s3[15];
char c;
int q[28]={0};
int main(){
    cin>>t;
    while(t--){
        memset(q,0,sizeof(q));
        cin>>n;
    set<pair<char,string> >ret;
        for(int i=1;i<=n;i++){
            cin>>s1[i]>>c>>s3;
            if(strcmp(s2[0],s3)==0){
            	pair<char,string> p;
            	p.first=c;
				p.second=s1[i];
               ret.insert(p);
            }
        }
        set<pair<char,string> >::iterator it;
        for(it=ret.begin();it!=ret.end();++it){
        	//cout<<it->first<<" "<<it->second<<endl;
        	char p2=it->first;
          int p1=(int)(p2-'A');
               q[p1]++;
		}
            /*multimap<string, char>::iterator it;
        for(it=map2.begin();it!=map2.end();++it){
        	cout<<it->first<<":"<<it->second<<endl;
          //char p=it->second;
          //int p1=(int)(p-'A');
             //   q[p1]++;
        }
        /*for(int i=0;i<='Z'-'A';i++){
          cout<<q[i]<<" ";
        }*/
       //cout<<endl;*/
       int mx=0;
        char m;
        for(int i='Z'-'A';i>=0;i--){
            if(q[i]>=mx){
                mx=q[i];
                m=(char)(i+'A');
            }
        }
        cout<<m<<endl;
    }
    return 0;
}
/*2
5
teamA A accepted
teamB B rejected
teamC A accepted
teamB B accepted
teamD C accepted
4
teamA A rejected
teamB A accepted
teamC C accepted
teamC C accepted*/