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:
Sexual reproduction involves the union of cells from ____ parents.

Ex Output:
two


Ex Input:
Most amphibians reach maturity at three or ____ years.

Ex Output:
four


Ex Input:
Corals only grow by ____ centimetres a year.

Ex Output:

two