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

Ex Input:
Pelagic division is divided into neritic and _ levels of pelagic provinces.

Ex Output:
three

Ex Input:
Hoatzin has typical foot with _ toes forwards and one backwards.

Ex Output:
three

Ex Input:
State law requires every dog or cat be vaccinated at _ months of age and annually thereafter.

Ex Output:
four