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#include <iostream>
#include <string>

using namespace std;

int main()
{
	int w = 0;

	int bitCount = 0;

	bool even = false;
	int temp = 0;

	string s = "";
	string out = "";
	string table = "acgo";

	cin >> w;
	cin >> s;

	for (int i = 0; i < w * 8; i++)
	{
		if (s[i] == '1')
			bitCount++;
	}

	bitCount -= (2 * w);

	if (bitCount <= w || bitCount >= 4 * w)
	{
		out = "NIE";
		bitCount = 0;
	}

	while (bitCount > 0)
	{
		even = false;
		for (int i = 4; i >= 1 && !even; i--)
		{
			even = false;
			if (bitCount % i == 0)
				even = true;

			if (even)
				temp = (bitCount / i);
			else
				temp = (bitCount / i) + 1;

			even = false;

			if (temp >= w && i <= bitCount)
			{
				out += table[i - 1];
				w--;
				bitCount -= i;
				even = true;
			}
		}
	}

	cout << out;

	return 0;
}