#include <iostream>

 #include <algorithm>

 #include <cstdio>

 #include <cstring>

 #include <string>

 #include <set>

 #include <vector>

 using namespace std;

 set<string> dic;

 vector<string> ans;

 set<string>::iterator it;

 int main()

 {

     //freopen("in.txt", "r", stdin);

     string s;

     while(cin >> s) dic.insert(s);

     for(it = dic.begin(); it != dic.end(); it++)

     {

         s = *it; int l = s.length();

         for(int i = ; i < l; i++)

         {

             string s1 = s.substr(, i);

             string s2 = s.substr(i, l - i);

             if(dic.count(s1) && dic.count(s2))

             {

                 ans.push_back(s);

                 break;

             }

         }

     }

     sort(ans.begin(), ans.end());

     for(int i = ; i < ans.size(); i++) cout << ans[i] << endl;

     return ;

 }