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: Spiritual slavery comes in ____ forms.

Output: two


Input: Consider Input: Most ovarian cysts go away on their own in ____ to three months without causing any problems.


Output: one