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:
Ozone leaves ____ by-products except pure oxygen.

Ex Output:
no


Ex Input:
Seasonal records indicate that, in most years, ____ generations occur.

Ex Output:
two


Ex Input:
Chickadees have a complex social system with ____ extremes.

Ex Output:

two