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.

Ex Input:
Edges Usually refers to the ____ outside edges of the pages of a book.

Ex Output:
three


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

Ex Output:
four


Ex Input:
Acupuncture needles are about two to ____ inches long.

Ex Output:

three