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

Ex Input:
Perennial grass takes _ to five years before it is mature enough to produce adequate seed.

Ex Output:
three


Ex Input:
Chicks take _ years to develop full adult plumage.

Ex Output:
five


Ex Input:
Movement is aided by _ sets of longitudinal muscles that extend throughout the entire body.

Ex Output:

four