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#include <iostream>
#include <vector>

using namespace std;

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

	int N;
	cin >> N;

	int cnt1 = 0;
	for (int i = 0; i < 8*N; i++) {
		char c;
		cin >> c;
		if (c == '1')
			cnt1++;
	}

	if (cnt1 < 3*N || cnt1 > 6*N) {
		cout << "NIE";
	} else {
		cnt1 -= 2*N;
		for (int i = 0; i < N; i++) {
			int m = min(4, cnt1 - (N-i-1));
			char c;
			switch (m) {
				case 1: c = 'a'; break;
				case 2: c = 'c'; break;
				case 3: c = 'g'; break;
				case 4: c = 'o'; break;
			}
			cout << c;
			cnt1 -= m;
		}
	}

	cout << endl;

	return 0;
}