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

int main()
{
    ios_base::sync_with_stdio(0);
    cout.tie(0);
    cin.tie(0);

    int a;
    cin >> a;

    int tab[2] = {0, 0};

    char c;

    for(int i = 0; i < a * 8; i++)
    {
        cin >> c;

        tab[(c == '1')]++;
    }

    if(tab[1] < 3 * a || tab[1] > 6 * a)
    {
        cout << "NIE" << endl;

        return 0;
    }

    tab[1] -= (3 * a);

    char znak[4] = {'a', 'c', 'g', 'o'};

    int index;

    for(int i = 0; i < a; i++)
    {
        index = min(tab[1], 3);
        cout << znak[index];
        tab[1] = max(tab[1] - 3, 0);
    }
    cout << endl;

    return 0;
}