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#include <bits/stdc++.h>
using namespace std;
string s;
int n, cnt[2];

void nie() {
    cout << "NIE\n";
    exit(0);
}

void put(int c) {
    for (int i = 0; i < 5; i++) {
        if (c >> i & 1) cnt[1]--;
        else cnt[0]--;
    }

    s += (char)c;
}

int32_t main() {
    ios_base::sync_with_stdio(0);
    cin >> n >> s;
    for (auto i : s) cnt[i - '0']++;
    if (cnt[0] < n) nie();
    if (cnt[1] < 2 * n) nie();
    
    cnt[0] -= n, cnt[1] -= 2*n;

    s = "";
    while (s.size() < n) {
        int x = cnt[0] - cnt[1];
        //cout << x << endl;
        if (x > 2) put('a');
        else if (x < -2) put('o');
        else if (x >= 0) put('c');
        else put('g');
    }

    if (cnt[0] != 0 || cnt[1] != 0) nie();
    cout << s << "\n";
    
}