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 amphibians reach maturity at three or ____ years.

Ex Output:
four


Ex Input:
Animals exhibit ____ patterns for bringing sperm and eggs together.

Ex Output:
two


Ex Input:
Partnerships are like marriages, and they take ____ months to a year to really develop.

Ex Output:

six