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.

Input: Consider Input: Elephants have five toes on the fore feet and ____ on the hind feet.

Output: four

Input: Consider Input: Nests Have at least one nest for every three to ____ hens.

Output: four

Input: Consider Input: Musical usage predates the psychiatric by nearly ____ centuries.
Output: three