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 organ systems are operational in the fetus by ____ to six months.

Ex Output:
four


Ex Input:
Plants generally live ____ years but sometimes longer.

Ex Output:
two


Ex Input:
Temperature can effect an enzyme in ____ ways.

Ex Output:

two