学步园

#include<iostream>
#include<algorithm>
#include<vector>
#include<set>
#include<string>

using namespace std;
int main(){
	//freopen("in.txt","r",stdin);
	set<string>se;
	vector<string>v;
	strings;
	while(cin>>s){
		se.insert(s);
		v.push_back(s);
	}
	for(int i=0;i<v.size();i++){
		for(int j=0;j<v[i].length();j++){
			if(se.find(v[i].substr(0,j))!=se.end() && se.find(v[i].substr(j))!=se.end() ){
			    	cout<<v[i]<<"\n";
					break;
			}
		}
	}
}