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:
Most litters contain two to ____ kittens.

Ex Output:
four


Ex Input:
Marine biologists have ____ theories on why whales breach.

Ex Output:
two


Ex Input:
Nymphs feed and mature through ____ instars in about six to eight weeks.

Ex Output:

five