#include<bits/stdc++.h>
#define i64 long long
#define mx(a,b,c) max(a,max(b,c))
#define mn(a,b,c) min(a,min(b,c))
#define eef else if
#define ff(i,s,e) for(int i=(s); i<e; i++)
#define ff2(i,s,e) for(int i=(s); i>=e; i--)
#define sf scanf
#define pf printf
#define dbug(x) cout<<"x = "<<x<<endl
#define newl cout<<"\n"
#define putcase cout<<"Case "<<++cse<<":"
using namespace std;
int main()
{
vector<string>vs;
map<string,bool>mp;
string s;
while(cin>>s){
vs.push_back(s);
mp[s]=true;
}
ff(i,0,vs.size()){
ff(j,0,vs[i].size()){
string s1=vs[i].substr(0,j+1);
string s2=vs[i].substr(j+1,vs[i].size());
//cout<<s1<<" "<<s2<<endl;
if(mp[s1] && mp[s2]){
cout<<vs[i]<<endl;
break;
}
}
}
// dbug(mp["zebra"]);
return 0;
}
#define i64 long long
#define mx(a,b,c) max(a,max(b,c))
#define mn(a,b,c) min(a,min(b,c))
#define eef else if
#define ff(i,s,e) for(int i=(s); i<e; i++)
#define ff2(i,s,e) for(int i=(s); i>=e; i--)
#define sf scanf
#define pf printf
#define dbug(x) cout<<"x = "<<x<<endl
#define newl cout<<"\n"
#define putcase cout<<"Case "<<++cse<<":"
using namespace std;
int main()
{
vector<string>vs;
map<string,bool>mp;
string s;
while(cin>>s){
vs.push_back(s);
mp[s]=true;
}
ff(i,0,vs.size()){
ff(j,0,vs[i].size()){
string s1=vs[i].substr(0,j+1);
string s2=vs[i].substr(j+1,vs[i].size());
//cout<<s1<<" "<<s2<<endl;
if(mp[s1] && mp[s2]){
cout<<vs[i]<<endl;
break;
}
}
}
// dbug(mp["zebra"]);
return 0;
}
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