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#include<bits/stdc++.h>
//#define int long long
#define ll long long
using namespace std;



string alg(){
	
	vector<char> V;		//1,2,3,4
	V.push_back('o');V.push_back('g');V.push_back('c');V.push_back('a');
	int n;cin>>n;
	string s;cin>>s;
	int x0=0,x1=0;
	for(char x:s) if(x=='0')x0++; else x1++;
	x0-= n; x1-=2*n;
	if(x0<n||x1<n) return "NIE";
	
	int c =n-x0%n;
	int a =x0/n;
	string w="";
	for(int i=0;i<c;i++) w+=V[a-1];
	for(int i=0;i<n-c;i++) w+=V[a];
//	if((a-1+1)*c+(n-c)*(a+1)!=x0) cout << "BLAAAAAAAAAAD";
	return w;
}


int32_t main(){

//	ios::sync_with_stdio(false); cin.tie(NULL);
	
	cout << alg();
	
}