#include <iostream> #include <algorithm> #include <string> using namespace std; string a[110]; bool cmp(string x, string y) {return x + y > y + x;} int main() { int n; cin >> n; for(int i = 1; i <= n; i++) cin >> a[i]; sort(a + 1, a + n + 1, cmp); for(int i = 1; i <= n; i++) cout << a[i]; cout << endl; return 0; }