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

Ex Input:
Pets also track in pollen, and _ out of every ten people is allergic to cat or dog dander.

Ex Output:
one


Ex Input:
Liquid crystals lack the full _ dimensional position and orientation order of ordinary crystals.

Ex Output:
three


Ex Input:
Normal sleep consists of _ types.

Ex Output:

two