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: Some animals have only ____ or three chambers .
Example Output: two

Example Input: Sponges are subdivided into ____ classes.
Example Output: three

Example Input: Mature cysts have ____ nuclei while the immature have two.
Example Output:
four