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#include <bits/stdc++.h>
using namespace std;
using ll = long long;

pair<int, char> res[4] = {{0,'a'}, {0,'c'}, {0,'g'}, {0,'o'}};

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    int n;
    char tmp;
    cin >> n;

    int cnt = 0;
    for(int i = 0; i < 8*n; i++) {
        cin >> tmp;
        cnt += (tmp == '1' ? 1 : 0);
    }

    if(cnt < 3*n or 6*n < cnt)
        cout << "NIE\n";
    else {
        cnt -= 3*n;
        res[3].first = cnt / 3;
        cnt %= 3;
        res[2].first = cnt / 2;
        cnt %= 2;
        res[1].first = cnt;
        res[0].first = n - res[1].first - res[2].first - res[3].first;
        for(int i = 0; i < 4; i++) {
            for(int j = 0; j < res[i].first; j++)
                cout << res[i].second;
        }
        cout << "\n";
    }

    return 0;
}