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#include "bits/stdc++.h"

using namespace std;

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

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

	if(!(oneCount >= n * 3 and oneCount <= n * 6)) {
		cout << "NIE\n";
		return 0;
	}

	array<char, 4> chars = { 'a', 'c', 'n', 'o' };
	char baseCharacter = (oneCount / n) - 3;
	for(int i = 0; i < n; i++) {
		if(i < oneCount % n)
			cout << chars[(oneCount / n) - 2];
		else
			cout << chars[(oneCount / n) - 3];
	}

	return 0;
}