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

vector<string> find_basic_commands(vector<string>& logs) {
    sort(logs.begin(), logs.end(), [](const string &a, const string &b) {
        return a.length() < b.length();
    });

    vector<string> basic_commands;
    for (const string& log : logs) {
        bool is_substring = false;
        for (const string& cmd : basic_commands) {
            if (log.find(cmd) != string::npos) {
                is_substring = true;
                break;
            }
        }
        if (!is_substring) {
            basic_commands.push_back(log);
        }
    }
    return basic_commands;
}

int main() {
    int C;
    cin >> C;
    cin.ignore();

    for (int case_idx = 1; case_idx <= C; ++case_idx) {
        int N;
        cin >> N;
        cin.ignore();

        vector<string> logs(N);
        for (int i = 0; i < N; ++i) {
            getline(cin, logs[i]);
        }

        vector<string> result = find_basic_commands(logs);

        cout << "Case #" << case_idx << ": " << result.size();
        for (const string& cmd : result) {
            cout << " " << cmd;
        }
        cout << "\n";
    }
    return 0;
}