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

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

    int n;
    cin >> n;

    int ones = 0;
    for(int i = 0; i < 8 * n; i++) {
        char c;
        cin >> c;
        ones += (c == '1');
    }

    int zeros = 8 * n - ones;

    string ans = "";
    while(zeros > 0 && ones > 0 && ans.size() < n) {
        int diff = ones - zeros;
        if(diff < 0) {
            ans += 'a';
            ones -= 3, zeros -= 5;
        }
        else if(diff == 0) {
            ans += 'c';
            ones -= 4, zeros -= 4;
        }
        else if(diff >= 4) {
            ans += 'o';
            ones -= 6, zeros -= 2;
        }
        else {
            ans += 'g';
            ones -= 5, zeros -= 3;
        }
    }

    cout << (ones == 0 && zeros == 0 && ans.size() == n ? ans : "NIE") << "\n";

    return 0;
}