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: Marriage is the legal union of ____ people.

Output: two


Input: Consider Input: Carbon atoms are tetravalent, and therefore, can have ____ bonding pairs around each carbon atom.

Output: four


Input: Consider Input: Most adults sleep between ____ and eight hours a night.


Output: seven