#include <bits/stdc++.h>
using namespace std;
  
int main(){
    int n,x,a[100],i;
    cin>>n;
    for(i = 0;i < n;i++){
        cin>>a[i];
    }
    sort(a,a+n);
      
    for(i = n - 1;i >= 0;i--){
        cout<<a[i];
    }
}
/**************************************************************
	Problem: 1451
	User: yangjunwen
	Language: C++
	Result: Accepted
	Time:14 ms
	Memory:2076 kb
****************************************************************/