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#include <bits/stdc++.h>

using namespace std;

char letters[7] = {'x', 'x', 'x', 'a', 'c', 'g', 'w'};

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    int n;
    string mess;
    cin >> n >> mess;

    int ones = 0;
    for (int i = 0; i < 8 * n; ++i) {
        if (mess[i] == '1') {
            ++ones;
        }
    }

    if (ones < 3 * n or ones > 6 * n) {
        cout << "NIE";
    } else {
        int surplus = ones - 3 * n;
        for (int i = 0; i < n; ++i){
            if (surplus >= 3){
                cout << letters[6];
                surplus -= 3;
            } else {
                cout << letters[3 + surplus];
                surplus = 0;
            }
        }
    }
    return 0;
}