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// Project: zak
#include <bits/stdc++.h>
using namespace std;

int n;
map<int, char> bletts;

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    bletts[0] = 'a';
    bletts[1] = 'c';
    bletts[2] = 'g';
    bletts[3] = 'o';

    cin >> n;
    int c1 = 0;
    for (int i = 0; i < 8 * n; i++) {
        char a;
        cin >> a;
        c1 += (a == '1');
    }

    if (c1 > n * 6 || c1 < n * 3) {
        cout << "NIE\n";
        return 0;
    }

    c1 -= n * 3;

    int bd = 3;

    string buff = "";

    for (int i = 0; i < n; i++) {
        while (bd > c1) bd--;
        buff += bletts[bd];
        c1 -= bd;
    }

    cout << buff << '\n';
}