#include <bits/stdc++.h>
using namespace std; 
int main()
{
    int n, m[1000000];
    cin >> n;
    for (int i = 1;i <= n;i++)
    {
        cin >> m[i];
    }
    
    sort(m + 1, m + n + 1);
    
    for (int i = n;i >= 1;i--)
    {
        cout << m[i];
    }
    return 0;
}