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

struct CASE{
	string tid;
	char pid;
	string result;
};

const int MAX = 10010;
int t,n;
CASE cs[MAX];
int zm[26];

char maxzm(int zm[26]){
	int max = 0;
	int size = 0;
	for(int i = 0;i < 26;i++){
		if(max < zm[i]){
			max = zm[i];
			size = i;	
		}
//		cout << zm[i] << " ";
	}
//	cout << endl;
	size += 65;
	return (char)size;
}

int main(){
	cin >> t;
	for(int i = 0;i < t;i++){
		cin >> n;
		for(int j = 0;j < n;j++){
			cin >> cs[j].tid >> cs[j].pid >> cs[j].result;
			if(cs[j].result == "rejected"){
				j--;
				n--;
				continue;
			}	
			if(cs[j].result == "accepted"){
				if (cs[j].pid >= 'A' && cs[j].pid <= 'Z'){
					int size = cs[j].pid - 65;
					int flag = 0;
					for(int k = 0;k < j;k++){
						if(cs[j].tid == cs[k].tid && cs[j].pid == cs[k].pid && cs[j].result == cs[k].result){
							flag = 1;
							break;	
						}	
					}
					if(flag == 1){
						j--;
						n--;
						continue;
					}else{
						zm[size]++;
					}
				}	
			}	
		}
		cout << maxzm(zm) << endl;
		for(int i = 0;i < 26;i++){
			zm[i] = 0;
		}
	}
	return 0;
}

answer.code:2:13: error: ‘longlong’ does not name a type
    2 | #define int longlong
      |             ^~~~~~~~
answer.code:11:7: note: in expansion of macro ‘int’
   11 | const int MAX = 10010;
      |       ^~~
answer.code:2:13: error: ‘longlong’ does not name a type
    2 | #define int longlong
      |             ^~~~~~~~
answer.code:12:1: note: in expansion of macro ‘int’
   12 | int t,n;
      | ^~~
answer.code:13:9: error: ‘MAX’ was not declared in this scope
   13 | CASE cs[MAX];
      |         ^~~
answer.code:2:13: error: ‘longlong’ does not name a type
    2 | #define int longlong
      |             ^~~~~~~~
answer.code:14:1: note: in expansion of macro ‘int’
   14 | int zm[26];
      | ^~~
answer.code:2:13: error: ‘longlong’ was not declared in this scope
    2 | #define int longlong
      |             ^~~~~~~~
answer.code:16:12: note: in expansion of macro ‘int’
   16 | char maxzm(int zm[26]){
      |            ^~~
answer.code:2:13: error: ‘longlong’ does not name a type
    2 | #define int longlong
      |             ^~~~~~~~
answer.code:31:1: note: in expansion of macro ‘int’
   31 | int main(){
      | ^~~