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#include <iostream>
using namespace std;
char tab[4] = {'a', 'c', 'g', 'o'};
int main(){
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  int ones = 0, n;
  string x;
  cin >> n >> x;
  for(int i = 0; i < x.size(); i++)
    ones += x[i] == '1';
  int maxnumones = ones/n;
  if(maxnumones < 3 or maxnumones > 6 or (maxnumones == 6 and maxnumones*n < ones)){
    cout << "NIE\n";
    return 0;
  }
  int rest = ones - maxnumones*n;
  for(int i = 0; i < n; i++)
    if(i < rest)
      cout << tab[maxnumones - 2];
    else
      cout << tab[maxnumones - 3];
  cout << endl;
  return 0;
}