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#include<iostream>
#include<vector>

using namespace std;

char tab[7] = { 'x', 'x', 'x', 'a', 'c', 'g', 'o' };

int main()
{
	int n; string s; 
	cin >> n >> s;
	
	int ones = 0;
	for (char x : s)
		ones += int(x == '1');
	if (ones < 3 * n or ones > 6 * n) {
		cout << "NIE\n";
		return 0;
	}
	int value = ones / n;
	int add_one = ones - (n * value);
	for (int i = 0; i < n; i++) {
		if (i < add_one)
			cout << tab[value + 1];
		else 
			cout << tab[value];
	}
	cout << "\n";
}