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#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
#define rep(a, b) for(int a = 0; a < (b); ++a)
#define st first
#define nd second
#define pb push_back
#define all(a) a.begin(), a.end()
int main() {
	ios_base::sync_with_stdio(0); cin.tie(0);
	int n, sum=0;
	string s;
	cin >> n >> s;
	for(auto i : s) if(i=='1') ++sum;
	if(sum<3*n || sum>6*n) {
		cout << "NIE\n";
		return 0;
	}
	ll a=n, c=0, g=0, w=0;
	sum-=a*3;
	while(sum--) {
		if(a) {
			--a;
			++c;
		} else if(c) {
			--c;
			++g;
		} else if(g) {
			--g;
			++w;
		}
	}
	while(a--) cout << 'a';
	while(c--) cout << 'c';
	while(g--) cout << 'g';
	while(w--) cout << 'w';
	cout << '\n';
}