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

Ex Input:
White sturgeon inhabit _ large river systems, all on the western coast of North America.

Ex Output:
three


Ex Input:
Sprawl destroys _ million acres of farmland every two years.

Ex Output:
one


Ex Input:
Microtubular systems contain at least _ a-tubulin isoforms.

Ex Output:

three