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

Example Input: Most biologists divide the living world into _ Kingdoms.
Example Output: five

Example Input: Sprawl destroys _ million acres of farmland every two years.
Example Output: one

Example Input: Spiders are different from insects, spiders have eight legs and insect only have _ legs.
Example Output:
six