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

Example Input: Comets are a bit like giant dirty ice-balls with diameters between _ and fifty kilometres.
Example Output: five

Example Input: Cubs stay with their mothers for up to _ years.
Example Output: three

Example Input: Sharks have a total of _ senses, five of which are involved in locating food.
Example Output:
six