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

Ex Input:
Smokers die an average of six to _ years earlier than nonsmokers.

Ex Output:
eight


Ex Input:
Air resistance is _ at zero velocity.

Ex Output:
zero


Ex Input:
Monoclinic crystals have _ axes that are unequal in length.

Ex Output:

three