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:
Owls have ____ toes on each foot, like most birds.

Ex Output:
four


Ex Input:
Tin exists in ____ allotropic forms.

Ex Output:
three


Ex Input:
Man therefore has ____ different substances interacting with each other.

Ex Output:

two