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

Ex Input:
World population continues to rise, even as a few countries move toward _ growth.

Ex Output:
zero


Ex Input:
Mammals have _ types of cartilage.

Ex Output:
three


Ex Input:
Winged ants have _ wings but the top wings are longer than the wings underneath.

Ex Output:

four