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

Example Input: Sprouts can grow as much as _ feet per year.
Example Output: six

Example Input: Whales have only _ enemies-man and the killer whale.
Example Output: two

Example Input: Pinnipeds have _ flippers - one pair in front, and one pair in back.
Example Output:
four