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: Allergic rhinitis is the most common allergic disease, with one in ____ Canadian adults affected.
Example Output: five

Example Input: Ostrichs only have ____ toes, and one toenail.
Example Output:
two