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

Ex Input:
Some manatees have _ or four nails on the tip of each flipper.

Ex Output:
three


Ex Input:
Healthy people can donate blood as often as once every _ weeks.

Ex Output:
eight


Ex Input:
Nodal planes are flat and extend infinitely in _ dimensions.

Ex Output:

two