UVa 10905 - Children's Game

// UVa 10905 - Children's Game

#include <string>
#include <algorithm>
#include <iostream>
using namespace std;

struct str {
	string s;
};

bool operator <(const str & a, const str & b) {
	return a.s + b.s > b.s + a.s;
}

int main() {
	int n;
	cin >> n;
	while (n) {
		str st[51];
		for (int i = 0; i < n; i++)
			cin >> st[i].s;
		sort(st, st + n);
		for (int i = 0; i < n; i++)
			cout << st[i].s;
		cout << endl;
		cin >> n;
	}
	return 0;
}