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#include <iostream>
#include <string>

using namespace std;

int main()
{
	int n;
	int l_jed = 0, l_zer = 0;
	cin >> n;
	
	char c;
	for (int i=0;i<8*n;++i)
	{
		cin >> c;
		if (c=='0') ++l_zer;
		if (c=='1') ++l_jed;
	}
	
	int l = (l_jed - l_zer)/2;
	if (l < -n || l > 2*n)
	{
		cout << "NIE" << endl;
		return 0;
	}
	
	int i;
	if (l <= 0)
	{
		for (i=0;i<-l;++i)
		{
			cout << 'a';
		}
		for (;i<n;++i)
		{
			cout << 'c';
		}
	}
	else if (l <= n)
	{
		for (i=0;i<l;++i)
		{
			cout << 'g';
		}
		for (;i<n;++i)
		{
			cout << 'c';
		}
	}
	else
	{
		for (i=0;i<l-n;++i)
		{
			cout << 'o';
		}
		for (;i<n;++i)
		{
			cout << 'g';
		}
	}

	cout << endl;

	return 0;
}