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

Ex Input:
Telescopes come in _ basic types - refractors and reflectors.

Ex Output:
two


Ex Input:
Pharmacists dispense nearly _ billion prescriptions a year.

Ex Output:
three


Ex Input:
Rabbits reach sexual maturity between three and _ months of age.

Ex Output:

six