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:
Tall fescue produces the ____ diazaphenanthrene alkaloids, perlolidone and perloline.

Ex Output:
two


Ex Input:
Blood Parrots are a hybrid of ____ Cichlids species.

Ex Output:
two


Ex Input:
Every paraxial system has ____ principal planes.

Ex Output:

two