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

Ex Input:
Some species bear living offspring only every _ to five years.

Ex Output:
three


Ex Input:
Many prosimians have at least _ nipples and produce litters rather than a single offspring.

Ex Output:
four


Ex Input:
Older caterpillars have _ different color forms.

Ex Output:

two