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:
Viceroys produce ____ generations per year, and the food habits of each generation differs.

Ex Output:
three


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

Ex Output:
two


Ex Input:
Numbers are the mean of five or ____ observations.

Ex Output:

six