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

Input: Consider Input: Southern moles are six to seven inches long and weigh _ to four ounces.

Output: three


Input: Consider Input: Reverse osmosis uses three to ten gallons of water to produce _ gallon of drinking water.

Output: one


Input: Consider Input: Carbon has six protons and _ electrons.


Output: six