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

Example Input: Mountain sheep have _ sharp teeth at the front of the mouth.
Example Output: eight

Example Input: Piglets are born with stripes, which disappear in the first _ months.
Example Output: six

Example Input: Sexual maturity occurs at _ to four years for females and four to five years for males.
Example Output:
three