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#include <bits/stdc++.h>
#define vt vector
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()
#define F first
#define S second
#define pb emplace_back
#define pii pair <int, int>
typedef long long ll;

using namespace std;

int main() {
	ios_base::sync_with_stdio(0);
	int n;
	cin >> n;
	int o = 0;
	for (int i = 0; i < n * 8; i++) {
		char c = getchar();
		if (c == '1') o++;
	}
	if (o < 3 * n || o > 6 * n) {
		cout << "NIE\n";
		return 0;
	}
	o -= 3 * n;
	for (int i = 0; i < n; i++) {
		if (o >= 3) {
			cout << "o";
			o -= 3;
		}
		else if (o == 2) {
			cout << "k";
			o -= 2;
		}
		else if (o == 1) {
			cout << "c";
			o -= 1;
		}
		else 
			cout << "a";
	}
	cout << " \n";
}