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

Ex Input:
Females reach sexual maturity around four to _ year-olds.

Ex Output:
five


Ex Input:
Polymer clay is formed to metal spring back barrettes, and are available in _ different styles.

Ex Output:
five


Ex Input:
Astronomers think the solar system is more than _ billion years old.

Ex Output:

four