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:
Some species live for as little as ____ months.

Ex Output:
six

Ex Input:
Unequal cleavage can occur in ____ ways.

Ex Output:
two