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

Ex Input:
Mares normally give birth to their first foal when they are between _ and six years of.

Ex Output:
three


Ex Input:
Most people see the world through _ types of visual-receptor cells.

Ex Output:
four


Ex Input:
Most smokers go through _ states of quitting.

Ex Output:

five