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 species have ____ toes, three of which are forward-pointing.

Ex Output:
four


Ex Input:
Most people become sick ____ to seven days after infection.

Ex Output:
two


Ex Input:
Opsins are G protein coupled receptors and have ____ transmembrane domains.

Ex Output:

seven