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#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
#define st first
#define nd second
#define pb push_back
#define rep(i,a,b) for(ll i=a;i<=b;i++)
#define all(a) a.begin(),a.end()

int main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	int n; cin >> n;
	string s; cin >> s;
	int ile = 0;
	for(auto c : s) if(c == '1') ile++;
	if(ile > n*6 || ile < n*3){
		cout << "NIE\n";
		return 0;
	}
	while(ile > 5*n){
		cout << 'o';
		ile -= 6;
		n--;
	}
	while(ile > 4*n){
		cout << 'g';
		ile -= 5;
		n--;
	}
	while(ile > 3*n){
		cout << 'c';
		ile -= 4;
		n--;
	}
	while(ile > 2*n){
		cout << 'a';
		ile -= 3;
		n--;
	}
	cout << "\n";
}