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#include <bits/stdc++.h>
using namespace std;
const int N = 30;
string a[N];
bool cmp(const string &a, const string &b) {
//自定义排序函数，这一步非常巧妙，假设a=321，b=32；a+b=32132，b+a=32321
// 这样下面sort排下来就是32>321避免出现32132>32321的情况
return a + b > b + a;
}
int main() {
int n;
cin >> n;
for (int i = 1; i <= n; i++) cin >> a[i];
sort(a + 1, a + 1 + n, cmp);
for (int i = 1; i <= n; i++)cout << a[i];
return 0;
