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#include <iostream>

using namespace std;

char l1 = 'a';
char l2 = 'c';
char l3 = 'g';
char l4 = 'o';

int main() {
    int n;
    char c;
    cin >> n;
    int totalj = 0;
    int minj = n * 3;
    int maxj = n * 6;
    for (int i = 0; i < n; ++i) {
        for (int j = 0; j < 8; ++j) {
            cin >> c;
            if (c == '1') {
                totalj++;
            }
        }
    }
    if (totalj < minj || totalj > maxj) {
        cout << "NIE" << endl;
        return 0;
    }
    int nadmiar = totalj - minj;
    // cout << "NADMIAR: " << nadmiar << endl;
    int leftover = n;
    while (nadmiar >= 3) {
        cout << l4;
        nadmiar -= 3;
        leftover--;
    }
    if (nadmiar == 2) {
        cout << l3;
        leftover--;
    }
    if (nadmiar == 1) {
        cout << l2;
        leftover--;
    }
    for (int i = 0; i < leftover; ++i) {
        cout << l1;
    }
    cout << endl;
    return 0;
}