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:
Light chains exist in ____ classes, lambda and kappa.

Ex Output:
two


Ex Input:
Rabbits have a total of ____ teeth rather than four, as is characteristic of rodents.

Ex Output:
six


Ex Input:
Many vultures have a bald head , with ____ feathers .

Ex Output:

no