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#include <bits/stdc++.h>

using namespace std;
typedef string string;

string solve(int n, int lic){
	if(lic < 3*n || lic > 6*n) return "NIE";
	
	string ans = "";
	if(lic % 3 == 1) {
		ans += 'c';
		lic -= 4;
	}
	else if(lic % 3 == 2) {
		ans += 'g';
		lic -= 5;
	}
	else if(lic == 6*n) {
		ans += 'o';
		lic -= 6;
	}
	else {
		ans += 'a';
		lic -= 3;
	}
	
	lic /= 3;
	n--;
	lic -= n;
	for(int i = 0; i < lic; i++){
		ans += 'o';
	}
	for(int i = lic; i < n; i++){
		ans += 'a';
	}
	return ans;
}

int main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	int n, lic = 0;
	cin >> n;
	string s;
	cin >> s;
	for(int i = 0; i < 8*n; i++){
		if(s[i] == '1') lic++;
	}
	if(lic < 3*n || lic > 6*n) cout << "NIE";
	else cout << solve(n, lic);
	
	return 0;
}