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#include <bits/stdc++.h>

using namespace std;

unordered_map<int,char> ratio_to_letter = {
        {3, 'a'},
        {4, 'c'},
        {5, 'g'},
        {6, 'o'}
};

int main() {
    std::ios_base::sync_with_stdio(false);
    std::cin.tie(nullptr);

    int n;
    cin >> n;
    string bits;
    cin >> bits;

    size_t count_one = std::count(bits.begin(), bits.end(), '1');
    size_t ratio = count_one / n;

    if (ratio <= 2 || (ratio == 6 && count_one % n != 0) || 7 <= ratio) {
        cout << "NIE";
        return 0;
    }

    size_t count = n - (count_one % n);
    string res = string(count, ratio_to_letter[ratio]) +
            string(n - count, ratio_to_letter[ratio + 1]);

    cout << res;
    return 0;
}