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:
Some countries require passports to be valid for ____ months after expiry of the visa.

Ex Output:
six


Ex Input:
Prairie dogs bear four or ____ young per litter.

Ex Output:
five


Ex Input:
Ligation is the process of permanently attaching the ____ pieces.

Ex Output:

two