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#include <iostream>
#include <cstdio>
#include <string>

char decode[] = { 'a', 'c', 'g', 'o' };

int main() {
	int n;
	std::string in;
	std::cin >> n >> in;
	int ones = 0;
	for (int i = 0; i < in.length(); ++i) {
		if (in[i] == '1') ++ones;
	}
	ones -= 3 * n;
	if (ones < 0 || ones > 3 * n) {
		std::cout << "NIE" << std::endl;
		return 0;
	}

	int base = ones / n;
	int more = ones % n;
	std::string answer;
	for (int i = 0; i < n; ++i) {
		if (i < more) {
			answer.push_back(decode[base + 1]);
		}
		else {
			answer.push_back(decode[base]);
		}
	}

	std::cout << answer << std::endl;
	return 0;
}