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

Ex Input:
Ozone leaves _ by-products except pure oxygen.

Ex Output:
no


Ex Input:
Trees can also be air layered but air layering usually takes four to _ months to be successful.

Ex Output:
six


Ex Input:
Numbers Use words to express numbers smaller than _ or at the beginning of a sentence.

Ex Output:

ten