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: Mollusks have one or ____ hearts.

Output: two


Input: Consider Input: Cells contain ____ families of small organic molecules.

Output: four


Input: Consider Input: Acute pain is sudden pain that goes away quickly, usually lasting for less than ____ months.


Output: three