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

Ex Input:
Excess potassium induces larval metamorphosis in _ marine invertebrate species.

Ex Output:
four


Ex Input:
Architectural shingles are twice or _ times as thick as ordinary shingles.

Ex Output:
three


Ex Input:
Sheep can be carriers for up to _ weeks after recovering from the infection.

Ex Output:

nine