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#include <iostream>

namespace {
  using std::cin;
  using std::cout;
  using std::getline;
  using std::stoull;

  using word_t = std::string;

  inline char const ONE = '1';
  inline char const KEY_BY_ONES[] = { 'a', 'c', 'g', 'o' };
}

int main() {
  word_t n_word;
  size_t n;
  word_t bin_word;
  size_t bin_word_size;  
  size_t zeros = 0, ones = 0;
 
  getline(cin, n_word);
  n = stoull(n_word);  
  getline(cin, bin_word);
  bin_word_size = bin_word.size();

  for (size_t k = 0; k < bin_word_size; ++k)
    if (bin_word[k] == ONE)
      ++ones;
    else
      ++zeros;

  if (ones < 3 * n || ones > 6 * n || 
      zeros < 2 * n || zeros > 5 * n) {
    cout << "NIE";
    return 0;
  }

  word_t message;
  size_t r;

  zeros -= n;
  ones -= 2 * n;

  r = zeros % n;
  if (r == 0)
    r = n;
  for (size_t k = 0; k < r; ++k)
    message.push_back(KEY_BY_ONES[ones / n - 1]);
  r = ones % n;
  for (size_t k = 0; k < r; ++k)
    message.push_back(KEY_BY_ONES[ones / n]);

  cout << message;
  return 0;
}