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

Input: Consider Input: Monsoons coming every three to _ years can add almost a foot of water to the mountain's surface.

Output: seven


Input: Consider Input: Some dentists prefer using the oral rinse for _ to five days at a time.

Output: three


Input: Consider Input: Frictional forces cause the _ plates to be locked together.


Output: two