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

Input: Consider Input: Armaments manufacturers use lithium to produce tritium in _ ways.

Output: two

Input: Consider Input: Psychiatrists say one out of _ people are mentally ill.

Output: four

Input: Consider Input: Black bears stand _ to six feet long and almost three feet at the shoulders when on all fours.
Output: five