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#include <iostream>
using namespace std;

int main() {
  int n, c1 = 0;
  char c;
  cin>>n;
  for (int i = 0; i < 8 * n; ++i) {
    cin>>c;
    if (c == '1') ++c1;
  }
  if (c1 < 3 * n || c1 > 6 * n) {
    cout<<"NIE"<<endl;
    return 0;
  }
  else {
    while(n > 0) {
      if (c1 - 3 >= 3 * (n - 1) && c1 - 3 <= 6 * (n - 1)) {
        cout<<'a';
        c1 -= 3;
      }
      else if (c1 - 4 >= 3 * (n - 1) && c1 - 4 <= 6 * (n - 1)) {
        cout<<'c';
        c1 -= 4;
      }
      else if (c1 - 5 >= 3 * (n - 1) && c1 - 5 <= 6 * (n - 1)) {
        cout<<'g';
        c1 -= 5;
      }
      else {
        cout<<'o';
        c1 -= 6;
      }
      --n;
    }
    cout<<endl;
  }

}