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:
Team handball is played with seven players per side, six court players, and ____ goalkeeper.

Ex Output:
one


Ex Input:
Grasshoppers produce sound by ____ mechanisms called stridulation and crepitation.

Ex Output:

two