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

Input: Consider Input: Mares normally give birth to their first foal when they are between _ and six years of.

Output: three


Input: Consider Input: All imaginary numbers are complex numbers with _ for the real part.

Output: zero


Input: Consider Input: Diarrheal disease kills _ million children every year.


Output: three