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#include <iostream>

using namespace std;

int main() {
    ios_base::sync_with_stdio(false);

    int N;
    int ones = 0;
    char inputChar;

    cin >> N;

    for (int i = 0; i < 8 * N; i++) {
        cin >> inputChar;
        if (inputChar == '1') {
            ones++;
        }
    }

    if (ones < N * 3) {
        cout << "NIE\n";
        return 0;
    }

    if (ones < N * 4) {
        int fours = ones - N * 3;
        for (int i = 0; i < N; i++) {
            if (i < fours) {
                cout << 'c';
            } else {
                cout << 'a';
            }
        }
        cout << "\n";
        return 0;
    }

    if (ones < N * 5) {
        int fives = ones - N * 4;
        for (int i = 0; i < N; i++) {
            if (i < fives) {
                cout << 'g';
            } else {
                cout << 'c';
            }
        }
        cout << "\n";
        return 0;
    }

    if (ones < N * 6) {
        int sixes = ones - N * 5;
        for (int i = 0; i < N; i++) {
            if (i < sixes) {
                cout << 'o';
            } else {
                cout << 'g';
            }
        }
        cout << "\n";
        return 0;
    }

    if (ones == N * 6) {
        for (int i = 0; i < N; i++) {
            cout << 'o';
        }
        cout << "\n";
        return 0;
    }

    cout << "NIE\n";
    return 0;
}