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:
Prions are protein molecules which have ____ metastable states.

Ex Output:
two


Ex Input:
Hypertension afflicts about ____ in four American adults, both men and women, of all ages.

Ex Output:
one


Ex Input:
Normal cats have ____ front toes and four back toes.

Ex Output:

five