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#include <bits/stdc++.h>

using namespace std;

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    
    int n;
    string bin;
    cin >> n >> bin;
    
    int onesCnt = 0;
    for (int i = 0; i < 8*n; ++i)
        onesCnt += bin[i] == '1';
    
    if (onesCnt < 3*n || onesCnt > 6*n)
    {
        cout << "NIE\n";
        return 0;
    }
    
    do
    {
        int avg = onesCnt / n;
        switch (avg)
        {
            case 3:
                putchar('a');
                break;
            case 4:
                putchar('c');
                break;
            case 5:
                putchar('g');
                break;
            case 6:
                putchar('o');
                break;
        }
        onesCnt -= avg;
    } while (--n);
    
    putchar('\n');
    return 0;
}