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

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

Example Input: Psychiatrists say one out of _ people are mentally ill.
Example Output: four

Example Input: Some signs have as many as _ different coats of color.
Example Output:
nine