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

Ex Input:
Some people routinely sleep only _ hours a night but feel fine during the day.

Ex Output:
four


Ex Input:
Gestation is _ to nine months long, after which a single calf is born.

Ex Output:
eight


Ex Input:
Wolves disperse from their family pack before they turn _ years old and some roam far away.

Ex Output:

three