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#include <bits/stdc++.h>
using namespace std;
#define fi first
#define se second
#define pb push_back
#define all(x) (x).begin(), (x).end()
#define mid (l+r)/2
#define PI acos((ld)-1)
#define BOOST ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0)
typedef long long ll;
typedef long double ld;
typedef pair<int, int> ii;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<ii> vii;
typedef vector<vi> vvi;

int main(){
	BOOST;
	int n, one = 0;
	string s;
	cin >> n >> s;
	for(int i=0; i<s.size(); i++)
		if(s[i] == '1')
			one++;
	vi nums(n);
	for(int i=0; i<n; i++)
		nums[i] += 3, one -= 3;
	if(one < 0){
		cout << "NIE";
		exit(0);
	}
	for(int i=0; i<n; i++)
		nums[i] += min(3, one), one -= min(3, one);
	if(one > 0){
		cout << "NIE";
		exit(0);
	}
	for(int i=0; i<n; i++){
		if(nums[i] == 3)
			cout << 'a';
		if(nums[i] == 4)
			cout << 'c';
		if(nums[i] == 5)
			cout << 'g';
		if(nums[i] == 6)
			cout << 'o';
	}
}