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

Ex Input:
Pangolins walk on all _ of their stout limbs, which are adapted for digging.

Ex Output:
four


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

Ex Output:
four


Ex Input:
Octal numbers are a convenient shorthand for groups of _ bits.

Ex Output:

three