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

Example Input: Babies are born about _ weeks after mating.
Example Output: five

Example Input: Credit reports describe an individual's credit history for the last _ to ten years.
Example Output: seven

Example Input: Puppy teeth begin to shed and be replaced by permanent adult teeth at about _ months of age.
Example Output:
four