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:
Prions are protein molecules which have ____ metastable states.

Ex Output:
two


Ex Input:
Kayak paddles have ____ blades, canoe paddles have one.

Ex Output:
two


Ex Input:
Insect history is divided into ____ phases.

Ex Output:

five