Uva 10905 Children's Game

#include <cstdio>
#include <cstring>
#include <iostream>
#include <algorithm>
using namespace std;
int n;
string s[51];
bool camp(string a,string b)
{
return a + b > b + a;
}
int main()
{
cin.sync_with_stdio(false);
while(cin>>n && n)
{
for(int i = 1;i <= n;i++) cin>>s[i];
sort(s+1,s+1+n,camp);
for(int i = 1;i <= n;i++) cout<<s[i];
cout<<endl;
}
}