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

Input: Consider Input: Humans host _ species of louse, the head louse , the body louse and the pubic louse .

Output: three


Input: Consider Input: Manatees reach sexual maturity in _ to five years.

Output: two


Input: Consider Input: Pigs have _ toes on each hoof.


Output: four