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

Ex Input:
Normal adults appear to require _ to eight hours of sleep per day on average.

Ex Output:
six


Ex Input:
Temperatures occasionally fall below _ but only last a very short time.

Ex Output:
zero


Ex Input:
Some species bear living offspring only every three to _ years.

Ex Output:

five