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.

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

Output: two


Input: Consider Input: HOD usually shows up as an acute lameness, often seeming to affect all ____ legs simultaneously.

Output: four


Input: Consider Input: Octagons have a centered symmetry with ____ axes.


Output: eight