#include <bits/stdc++.h>
using namespace std;
map<string,int> m;

auto solve() {
    int n;
    cin>>n;
    vector a(27, 0);
    vector vis(n + 5, vector(27, false));
    int j = 1;
    for (int i = 1; i <= n; i++) {
        string s1,s2;
        char zm;
        cin>>s1;
        cin>>zm;
        cin>>s2;
        if (m.find(s1) == m.end()) {
            m[s1] = j++;
        }
        if(!vis[m[s1]][zm - 'A'+1] and s2 == "accepted") {
            a[zm - 'A'+1]++;
            vis[m[s1]][zm - 'A'+1] = true;
        }
    }
    int ans = 0,ans_i = 0;
    for (int i = 1; i <= 26; i++) {
        if(a[i] > ans) {
            ans = a[i];
            ans_i = i;
        }
    }
    cout<<char(ans_i+64)<<endl;
}

signed main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int64_t t;
    cin >> t;
    while(t--)
        solve();
    return 0;
}