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#include <bits/stdc++.h>

const char acgo[] = "acgo";

int main()
{
    using namespace std;
    int n;
    cin >> n;
    string data;
    data.reserve(8 * n);
    cin >> data;
    int num1 = count(data.begin(), data.end(), '1');
    // cout << num1 << endl;
    if (num1 < 3 * n || num1 > 6 * n)
    {
        cout << "NIE\n";
        return 0;
    }
    int avg_low = num1 / n - 3;
    int num_hi = num1 % n;

    for (int i = 0; i < n - num_hi; ++i)
        cout << acgo[avg_low];
    for (int i = 0; i < num_hi; ++i)
        cout << acgo[avg_low + 1];
    cout << endl;
    return 0;
}