Given a sentence, fill out the missing word with a 'no' or a number (between zero and ten). You should write the numbers with english alphabet, like: four instead of 4.

Example Input: Arthropods are made up of ____ groups of living animals and one group of extinct animals.
Example Output: four

Example Input: Most spiders have eight eyes and ____ legs.
Example Output: eight

Example Input: Most spiders have ____ eyes in various arrangements.
Example Output:
eight