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

Example Input: Excess potassium induces larval metamorphosis in _ marine invertebrate species.
Example Output: four

Example Input: Cubs emerge from the den when they are four to _ months old.
Example Output: six

Example Input: Most lions drink water daily if available, but can go four or _ days without it.
Example Output:
five