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.

Example Input: Compound objects have ____ representations themselves.
Example Output: no

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

Example Input: Ozone is a gas that consists of ____ atoms of oxygen.
Example Output:
three