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#include <bits/stdc++.h> 

using namespace std;

int main() {
    cin.tie(0);
    ios::sync_with_stdio(0);
    int numberOfWords;
    cin >> numberOfWords;
    string s;
    cin >> s;
    int oneCounter = 0;
    for (int i = 0; i < 8 * numberOfWords; i++) {
        if (s[i] == '1') {
            oneCounter++;
        }
    }
    if (oneCounter < numberOfWords * 3 || oneCounter > numberOfWords * 6) {
        cout << "NIE" << endl;
        return 0;
    }
    vector<int> counters(4);
    counters[0] = numberOfWords;
    oneCounter -= numberOfWords * 3;
    while (oneCounter) {
        while (oneCounter > 2) {
            counters[0]--;
            counters[3]++;
            oneCounter -= 3;
        }
        if (oneCounter > 1) {
            counters[0]--;
            counters[2]++;
            oneCounter -= 2;
        }
        if (oneCounter > 0) {
            counters[0]--;
            counters[1]++;
            oneCounter -= 1;
        }
    }
    char toPrint[4] = {'a', 'c', 'g', 'o'};
    for (int i = 0; i < 4; i++) {
        while (counters[i]--) {
            cout << toPrint[i];
        }
    }
    cout << endl;
}