Bacon, Eggs, and Spam Solution:

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

int main(){
    // #ifndef TESTING
    // freopen("input.txt", "r", stdin);
    // freopen("output.txt", "w", stdout);
    // #endif

    string line, name, food;
    getline(cin, line);
    int people = stoi(line);
    map<string, vector<string>> mapp;
    
    do{
        while(people--){
            getline(cin, line);
            istringstream wordstream(line);
            wordstream >> name;
            while(wordstream >> food){
                auto it = mapp.find(food);
                if(it == mapp.end()){
                    mapp.insert({food, {name}});
                } else {
                    (*it).second.push_back(name);
                }
            }
        }
        for(auto i: mapp){
            cout << i.first << " ";
            sort(i.second.begin(), i.second.end());
            for(auto j: i.second){
                cout << j << " ";
            }
            i.second.clear();
            cout << endl;
        }
        mapp.clear();
        getline(cin, line);
        people = stoi(line);
        if(people){
            cout << endl;
        }
    } while(people);

    return 0;
}