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

Example Input: Aquatic adults have prominent red reathery gills, are large, and have _ toes on each foot.
Example Output: four

Example Input: Roaches have two forewings and _ hind wings.
Example Output: two

Example Input: Spores have _ combinations of sexes.
Example Output:
four