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#include <iostream>

using namespace std;

int n;
char c;
int bits;

char letters[7] = {'\0', '\0', '\0', 'a', 'c', 'g', 'o'};

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

	cin >> n;

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

	if(bits < 3*n || bits > 6*n){
		cout << "NIE";
		return 0;
	}

	//cout << bits << "\n";

	int k = 3;

	while(bits > k*n) k++;

	k--;

	int l = bits - k*n;

	for(int i=0;i<l;i++){
		cout << letters[k+1];
	}

	for(int i=0;i<n-l;i++){
		cout << letters[k];
	}

	return 0;
}