#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/trie_policy.hpp>

using namespace std;
using namespace __gnu_pbds;

typedef trie<
string,
null_type,
trie_string_access_traits<>,
pat_trie_tag,
trie_prefix_search_node_update>
pref_trie;

main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);

    pref_trie base;
    base.insert("sun");
    string x;
    while(cin>>x)
    {
        if(x[0]=='?')
        {
            cout<<x.substr(1)<<endl;
            auto range=base.prefix_range(x.substr(1));
            int t=0;
            for(auto it=range.first;t<20 && it!=range.second;it++,t++)
                cout<<"  "<<*it<<endl;
        }
        else
            base.insert(x.substr(1));
    }

}