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

Ex Input:
Mice are fertile animals because female mice come into heat every _ to five days.

Ex Output:
four


Ex Input:
Premolars have one, two, and sometimes _ canals.

Ex Output:
three


Ex Input:
Cats have five toes in the forepaws and _ in the hind paws.

Ex Output:

four