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#include <iostream>

using namespace std;

char letters[] = {'a', 'c', 'g', 'o'};

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

  int n;
  int ones_count = 0;

  cin >> n;

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

  if (ones_count < 3 * n || ones_count > 6 * n) {
    cout << "NIE";
    exit(0);
  }

  for (int i = n; i > 0; i--) {
    for (int j = 6; j >= 3; j--) {
      if (i * j <= ones_count) {
        ones_count -= j;
        cout << letters[j - 3];
        break;
      }
    }
  }

  return 0;
}