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#include <iostream>
using namespace std;
int main() {
	ios_base::sync_with_stdio(0);
	
	int n;
	string bits;
	cin>>n>>bits;
	
	int bilans = 0;
	for (int i = 0; i < bits.length(); i++) {
		if (bits[i] == '1') bilans++;
		else bilans--;
	}
	
	if (bilans % 2 != 0) {
		cout<<"NIE";
		return 0;
	}
	
	string s(n, 'c'); // c ma tyle samo 0 co 1
	for (int i = 0; i < n && bilans != 0; i++) {
		if (bilans <= -2) {
			s[i] = 'a';
			bilans -= (-2);
		}
		else if (bilans >= 4) {
			s[i] = 'o';
			bilans -= 4;
		}
		else if (bilans >= 2) {
			s[i] = 'g';
			bilans -= 2;
		}
	}
	
	if (bilans != 0) cout<<"NIE";
	else cout<<s;
	return 0;
}