ol_5_10

#include <iostream>
#include <fstream>
#include <vector>
#include <cmath>


using namespace std;

int main()
{
    ifstream cin("input.txt");

    int n;
    cin>>n;

    vector <long> a;
    a.resize(n);

    for(int i = 0; i < n; i++)
    {
        cin>>a[i];
        for(int j = 0; j < i; j++)
            if(a[i] == -a[j] && a[i] < a[j] || abs(a[i]) < abs(a[j]))
                swap(a[i], a[j]);
    }
    for(int i = 0; i < n; i++)
        cout<<a[i]<<' ';
}