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

Ex Input:
Several countries appear to have _ islands at all.

Ex Output:
no


Ex Input:
Whales have only _ enemies-man and the killer whale.

Ex Output:
two


Ex Input:
Most species have four fingers on the front limbs and _ toes on the hind.

Ex Output:

five