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#include <iostream>
#include <algorithm>
#include <vector>

using namespace std;

int main() {
    int n;
    cin >> n;
    string str;
    cin >> str;
    int count {};
    for (int i=0; i<n*8; i++) {
        if (str[i] == '1') {
            count++;
        }
    }
    if (count < 3*n || count > 6*n) {
        cout << "NIE" << endl;
        return 0;
    }
    count -= 3*n;
    for (int i=0; i<n; i++) {
        if (count >= 3) {
            cout << "o";
            count -= 3;
        } else if (count == 2) {
            cout << "g";
            count -= 2;
        } else if (count == 1) {
            cout << "c";
            count--;
        } else {
            cout << "a";
        }
    }
    cout << endl;
    return 0;
}