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:
Air resistance is _ at zero velocity.

Ex Output:
zero


Ex Input:
Sleep is a restful state of the body when there is little or _ conscious thought.

Ex Output:

no