In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

Ex Input:
Rattlers carry the eggs for six or _ months before giving birth.

Ex Output:
seven


Ex Input:
Pure water contains _ ions and is therefore a nonconductor .

Ex Output:
no


Ex Input:
Flu strikes within one to _ days after exposure to the virus.

Ex Output:

three