uva 10905

#include<cstdio>#include<string>#include<cstring>#include<iostream>#include<algorithm>using namespace std;bool cmp(string a,string b){return (b+a)<(a+b); }string str[1000];int main(){int n;while(~scanf("%d",&n)&&n){for(int i=0;i<n;i++)cin>>str[i];sort(str,str+n,cmp);for(int i=0;i<n;i++)cout<<str[i];cout<<endl; }}