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#include<bits/stdc++.h>
#define fi first
#define se second
#define pb push_back
using namespace std;

string s;

int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	int n, jed = 0;
	cin>>n>>s;
	n *= 8;
	for(int i=0; i<n; i++) if(s[i] == '1') jed++;
	if(8 * jed < 3 * n || 8 * jed > 6 * n)
	{
		cout<<"NIE";
		return 0;
	}
	while(jed > 0 && 8  * (jed - 3) >= 3 * n)
	{
		cout<<"w";
		jed -= 6;
		n -= 8;
	}
	if(jed % 3 == 2)
	{
		cout<<"k";
		jed -= 5;
		n -= 8;
	}
	if(jed % 3 == 1)
	{
		cout<<"c";
		jed -= 4;
		n -= 8;
	}
	while(jed > 0)
	{
		cout<<"b";
		jed -= 3;
		n -= 8;
	}
	return 0;
}