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

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

Ex Output:
two


Ex Input:
Grasshoppers develop through _ to six instars.

Ex Output:
five


Ex Input:
Reproductive maturity is reached at four to _ years in females and seven to nine years in males.

Ex Output:

six