In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

Input: Consider Input: Cats nurse their kittens up to _ weeks long.

Output: eight


Input: Consider Input: Scorpions can live for _ to seven years.

Output: three


Input: Consider Input: Stem cells form when an embryo is _ days old, and go on to make up every part of the body.


Output: four