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:
Cytochrome oxidase consists of two cytochromes and ____ copper atoms.

Ex Output:
two


Ex Input:
ATMs are expensive machines with an average useful life of ____ to fifteen years.

Ex Output:
ten


Ex Input:
All birds have ____ legs with four toes each.

Ex Output:

two