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:
Some botanists recognise ____ botanical varieties.

Ex Output:
two


Ex Input:
Sexual maturity is between ____ and six years of age.

Ex Output:
three


Ex Input:
Sexual reproduction combines the genetic materials of ____ plants.

Ex Output:

two