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#include <iostream>
#include <vector>

using namespace std;

int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);

	int size;
	cin >> size;

	int ones = 0;

	for(int index = 0; index < 8 * size; index++)
	{
		char value;
		cin >> value;

		if(value == '1')
		{
			ones++;
		}
	}

	if(ones < 3 * size)
	{
		cout << "NIE\n";
	}
	else if(ones <= 4 * size)
	{
		int count = ones - (3 * size);

		for(int index = 0; index < count; index++)
		{
			cout << 'c';
		}

		for(int index = count; index < size; index++)
		{
			cout << 'a';
		}

		cout << '\n';
	}
	else if(ones <= 5 * size)
	{
		int count = ones - (4 * size);

		for(int index = 0; index < count; index++)
		{
			cout << 'g';
		}

		for(int index = count; index < size; index++)
		{
			cout << 'c';
		}

		cout << '\n';
	}
	else if(ones <= 6 * size)
	{
		int count = ones - (5 * size);

		for(int index = 0; index < count; index++)
		{
			cout << 'o';
		}
		
		for(int index = count; index < size; index++)
		{
			cout << 'g';
		}

		cout << '\n';
	}
	else
	{
		cout << "NIE\n";
	}
}