Given a sentence, fill out the missing word with a 'no' or a number (between zero and ten). You should write the numbers with english alphabet, like: four instead of 4.

Example Input: Dogs have to be ____ months old before they are spayed or neutered.
Example Output: six

Example Input: Neuroblasts delaminate in five waves spanning approximately ____ hours.
Example Output: three

Example Input: Mistletoe plants are male or female with tiny yellow-green flowers with ____ petals.
Example Output:
four