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

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

Ex Output:
four


Ex Input:
Humans have _ sides to their brain functions.

Ex Output:
two


Ex Input:
Females give birth, on average, only once every _ years.

Ex Output:

eight