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#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
#ifdef LOC
#include "debuglib.h"
#else
#define deb(...)
#define DBP(...)
#endif
using namespace std;
using   ll         = long long;
using   Vi         = vector<int>;
using   Pii        = pair<int, int>;
#define pb           push_back
#define mp           make_pair
#define x            first
#define y            second
#define rep(i, b, e) for (int i = (b); i < (e); i++)
#define each(a, x)   for (auto& a : (x))
#define all(x)       (x).begin(), (x).end()
#define sz(x)        int((x).size())

int main() {
	cin.sync_with_stdio(0); cin.tie(0);
	cout << fixed << setprecision(12);

	int n;
	string s;
	cin >> n >> s;

	int zero = int(count(all(s), '0')) - n*2;
	int one = int(count(all(s), '1')) - n*3;

	if (zero < 0 || one < 0) {
		cout << "NIE\n";
		return 0;
	}

	string ans;

	while (zero >= 3) {
		ans.pb('a');
		zero -= 3;
	}

	if (zero == 2) ans.pb('c');
	else if (zero == 1) ans.pb('g');

	ans.resize(n, 'w');
	cout << ans << '\n';
	return 0;
}