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:
Scorpions have ____ legs.

Ex Output:
eight


Ex Input:
Calves remain with their mother until they are ____ years old.

Ex Output:

three