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: Smoking causes lung cancer in ____ ways.
Example Output: two

Example Input: Hearing is acute by three or ____ weeks and kittens learn to determine what sounds mean.
Example Output: four

Example Input: Crustaceans are the only arthropods that have a. b. c. d. ____ pairs of legs.
Example Output:
three