#include <bits/stdc++.h>
using namespace std;

int main() {
    
    int player_count = 0;

    cin >> player_count;
    vector<int> players(player_count, 0);
    for (int i = 0; i < player_count; i++)
    {
        cin >> players[i];
    }
    sort(players.begin(), players.end());
    for (int i = 0; i < player_count; i++)
    {
        cout << players[i];
    }
    return 0;
}