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#include <bits/stdc++.h>

using namespace std;

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

    long long n;
    cin >> n;

    long long k = 0;
    char a;
    for (int i = 0; i < n * 8; i++)
    {
        cin >> a;
        if (a == '1')
            k++;
    }
    long long m = k / n;
    k %= n;

    if (m < 3)
    {
        cout << "NIE\n";
        return 0;
    }
    if(k) m++;
    if (m > 6)
    {
        cout << "NIE";
        return 0;
    }
    for (int i = 0; i < n; i++)
    {
        if (i == k && k) m--;
        if (m == 3)
            cout << "a";
        else if (m == 4)
            cout << "c";
        else if (m == 5)
            cout << "g";
        else if (m == 6)
            cout << "o";
    }
}