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

Input: Consider Input: Every cell has _ long flagella.

Output: two


Input: Consider Input: Sexual selection has _ components, intrasexual competition and intersexual selection.

Output: two


Input: Consider Input: Reverse osmosis uses three to _ gallons of water to produce one gallon of drinking water.


Output: ten