Given a sentence, fill out the missing word with a 'no' or a number (between zero and ten). You should write the numbers with english alphabet, like: four instead of 4.

Ex Input:
Green energy comes in ____ basic forms.

Ex Output:
two


Ex Input:
Mosquitoes live four to ____ weeks.

Ex Output:
eight


Ex Input:
Top predators are at the top of the food chain and have ____ predators of their own.

Ex Output:

no