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

int main() {
	ios_base::sync_with_stdio(0); cin.tie(0);
	
	int n; cin >> n;
	string in; cin >> in;
	
	int cnt = 0;
	for (char c : in) if (c == '1') cnt++;
	
	if (cnt < 3 * n || cnt > 6 * n) {
		cout << "NIE" << endl;
		exit(0);
	} 
	
	char chars[] = {'#', '#', '#', 'a', 'c', 'g', 'w'};
	
	for (int i = 0; i < n; i++) {
		int up = ((cnt - 1) / (n - i)) + 1;
		
		cnt -= up;
		cout << chars[up];
	}
	
	cout << endl;
	
	return 0;
}