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

Input: Consider Input: Morocco has _ perennial rivers and many dams have been built with potential for power generation.

Output: four


Input: Consider Input: Acrobats mount a single bicycle until _ people in all are stacked on top of it.

Output: ten


Input: Consider Input: Rabbits reach sexual maturity between _ and six months of age.


Output: three