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:
Pyrimidines contain ____ ring and purines contain two rings.

Ex Output:
one


Ex Input:
Sexual maturity is reached at ____ years, and females calve every other year.

Ex Output:
four


Ex Input:
Humpbacks use at least ____ methods of feeding.

Ex Output:

two