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#include <bits/stdc++.h>
using namespace std;

int ile1;

int main()
{
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	
	int n;
	cin >> n;
	
	for(int i = 0; i < n<<3; ++i)
	{
		char a;
		cin >> a;
		if(a == '1') ++ile1;
	}
	
	ile1 -= 3*n;
	if(ile1 < 0 || ile1 > 3*n)
	{
		cout << "NIE";
		return 0;
	}
	
	for(int i = 0; i < n; ++i)
	{
		if(ile1 >= 3)
		{
			cout << 'o';
			ile1 -= 3;
		}
		else
		{
			if(ile1 == 0) cout << 'a';
			else if(ile1 == 1) cout << 'c';
			else cout << 'g';
			
			ile1 = 0;
		}
	}
	
	return 0;
}