#include<bits/stdc++.h>
using namespace std;
int main()
{
    int t;
    cin>>t;
    while(t--)
    {
        unordered_map<string,int> ump[26];
        int n,ans,maxn=0;
        cin>>n;
        for(int i=1;i<=n;i++)
        {
            char c;
            string name,b;
            cin>>name>>c>>b;
            if(b=="accepted")
            {
                ump[c-'A'][name]++;
            }
        }
        for(int i=0;i<26;i++)
        {
            if(ump[i].size()>maxn)
            {
                maxn=ump[i].size();
                ans=i;
            }
        }
        cout<<(char)(ans+'A')<<"\n";
    }
    system("pause");
    return 0 ;
}