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#include "bits/stdc++.h"

using namespace std;

vector <int> w;

int main() {

    int n;
    string s;
    int z = 0;
    int je = 0;
    int l = 0;
    string o = "";

    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    cin >> n;
    cin >> s;

    w.reserve(n*8+7);

    w.push_back(0);

    for (int i = 0; i < n; i++)
    {

        for (int j = 0; j < 8; j++)
        {
            if (s[i*8+j] == '0')
                z++;
            else
                je++;
        }
    }

    for (int i = 0; i < n; i++)
    {
        w.push_back(3);
        l+=3;
    }

    int k = 1;

    while (l < je)
    {
        if (je-l >= 3)
        {
            w[k]+=3;
            l+=3;
        }
        else if (je-l == 2)
        {
            w[k]+=2;
            l+=2;
        }
        else if (je-l == 1)
        {
            w[k]+=1;
            l+=1;
        }
        else
        {
            w[k]+=0;
            l+=0;
        }
        k++;
    }

    for (int i = 1; i <= n; i++)
    {
        if (w[i] == 3)
            o+='a';
        else if (w[i] == 4)
            o+='c';
        else if (w[i] == 5)
            o+='g';
        else
            o+='o';

    }

    if (je < 3*n || je > 6*n)
        cout << "NIE";
    else
        cout << o;

    exit(0);
}