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#include <iostream>

using namespace std;

int main()
{
	int n, a=0;
	char c;
	cin >> n;
	for (int i = 0; i < 8 * n; i++)
	{
		cin >> c;
		if ('1' == c)a++;
	}
	if (a < 3 * n || a > 6 * n)
	{
		cout << "NIE";
		return 0;
	}
	a -= 3 * n;
	for (; a >= 3; a -= 3, n--)
	{
		cout << "w";
	}
	for (; n > 1; n--)
	{
		cout << "a";
	}
	if (0 == a && 1 == n)cout << "a";
	if (1 == a)cout << "c";
	if (2 == a)cout << "g";
}