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

Output: four


Input: Consider Input: Nests Have at least one nest for every three to ____ hens.

Output: four


Input: Consider Input: Most toddlers find it hard to sit still for more than a few seconds, let alone ____ minutes.


Output: three