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

Input: Consider Input: Essential oils have a non-toxic, residual effect of up to five months from just _ application.

Output: one


Input: Consider Input: Angiosperms are divided into _ groups- monocots and dicots.

Output: two


Input: Consider Input: Elliptical galaxies form when _ spiral galaxies collide.


Output: two