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: Lions spend much of their time resting and are active only about ____ hours every day.
Example Output: four

Example Input: Today there are ____ animals classified as unicellular.
Example Output:
no