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#include <bits/stdc++.h>
#define dbg(x) " [" << #x << ": " << (x) << "] "
using namespace std;
template<typename A,typename B>
ostream& operator<<(ostream& out,const pair<A,B>& p) {
    return out << "(" << p.first << ", " << p.second << ")";
}
template<typename T>
ostream& operator<<(ostream& out,const vector<T>& c) {
    out << "{";
    for(auto it = c.begin(); it != c.end(); it++) {
        if(it != c.begin()) out << ", ";
        out << *it;
    }
    return out << "}";
}
void solve() {
    int n;
    cin >> n;
    string s;
    cin >> s;
    int k = 0;
    for(char c : s) {
        if(c == '1') k++;
    }
    for(int o = 0; o <= (k -  3 * n) / 3; o++) {
        int sm = k - 3 * (n + o);
        if(sm >= 0) {
            int g = sm / 2;
            int a = n - o - sm + g;
            int c = sm - 2 * g;
            if(a >= 0) {
                cout << string(a,'a') << string(c,'c') << string(g,'g') << string(o,'o') << endl;
                return;
            }
        }
    }
    cout << "NIE" << endl;
}
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int testNum = 1;
    //cin >> testNum;
    for(int i = 1; i <= testNum; i++) {
        solve();
    }
    return 0;
}