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#include <bits/stdc++.h>
using namespace std;
#define pb push_back 
#define fi first
#define se second
#define ll long long
vector <int> v;
string s;
int n, ile, ile3, ile4, ile5, ile6;
int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(0), cout.tie(0);
	cin >> n >> s;
	for(int i = 0; i < s.size(); i++)
		ile += (s[i] == '1');
	ile3 = ile / 3;
	ile %= 3;
	if(ile)
		ile3--;
	if(ile == 1)
		ile4++;
	if(ile == 2)
		ile5++;
	while(ile3+ile4+ile5+ile6 > n && ile3 >= 2)
	{
		if(!ile3)
		{
			cout<< "NIE\n";
			return 0;
		}
		ile6++, ile3 -= 2;
	}
	if(ile3+ile4+ile5+ile6 != n)
	{
		cout<< "NIE\n";
		return 0;
	}
		
	while(ile6--)
		cout << 'o';
	while(ile5--)
		cout << 'n';
	while(ile4--)
		cout << 'l';
	while(ile3--)
		cout << 'h';
	cout << "\n";
}