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

Ex Input:
Most insects have _ wings, but dipterans have only two.

Ex Output:
four


Ex Input:
Most people stay three or four years, sometimes _ or six years.

Ex Output:
five


Ex Input:
Many vultures are also bald, meaning they have _ feathers on their head.

Ex Output:

no