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#include <iostream>
#include <vector>
using namespace std;

int main()
{
    cin.tie(0);
    ios_base::sync_with_stdio(0);
    
    int n, sum=0;
    cin >> n;
    vector <int> v(n, 3);

    for (int i = 0; i < n * 8; i++) {
        char c;
        cin >> c;
        if (c == '1')
            sum++;
    }

    if (sum > n * 6 || sum < n * 3) {
        cout << "NIE" << "\n";
    }
    else {
        int it = 0;
        while (sum > n * 3) {
            v[it]++;
            it++;
            it %= n;
            sum--;
        }

        for (auto& x : v) {
            switch (x) {
            case 3:
                cout << 'a';
                break;
            case 4:
                cout << 'c';
                break;
            case 5:
                cout << 'g';
                break;
            default:
                //6
                cout << 'o';
            }
        }
        cout << "\n";

    }

}