# include <algorithm> # include <iostream> # include <string> using namespace std; bool cmp(string a,string b){ return (a+b > b+a); }int main(){ int n; cin >> n; string a[n]; for (int i = 0;i < n;i++) cin >> a[i]; sort(a,a+n,cmp); for (int i = 0;i < n;i++) cout << a[i]; return 0; }