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#include <iostream>

using namespace std;

int main()
{
	int n;
	string s;
	cin >> n;
	cin >> s;
	int count = 0; // count of 1's
	for (int i = 0; i < s.length(); i++) {
		if (s[i] == '1') {
			count++;
		}
	}
	if (count < 3 * n) {
		cout << "NIE";
		return 0;
	}
	if (count > 6 * n) {
		cout << "NIE";
		return 0;
	}
	int count_a = 0, count_c = 0, count_g = 0, count_o = 0;
	while ((count - 3) >= 3) {
		count -= 3;
		count_a++;
	}
	while ((count - 4) >= 3) {
		count -= 4;
		count_c++;
	}
	while ((count - 5) >= 3) {
		count -= 5;
		count_g++;
	}
	if (count == 3) {
		count_a++;
		count -= 3;
	}
	if (count == 4) {
		count_c++;
		count -= 4;
	}
	if (count == 5) {
		count_g++;
		count -= 5;
	}
	if (count > 0) {
		cout << "NIE";
		return 0;
	}
	int x = count_a + count_c + count_g - n;
	if (x > 0) {
		count_a -= 2 * x;
		count_o += x;
	}
	string ans = "";
	for (int i = 0; i < count_a; i++) {
		ans += 'a';
	}
	for (int i = 0; i < count_c; i++) {
		ans += 'c';
	}
	for (int i = 0; i < count_g; i++) {
		ans += 'g';
	}
	for (int i = 0; i < count_o; i++) {
		ans += 'o';
	}
	cout << ans;
}