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:
Cognitive therapy is a time-limited treatment lasting ____ to four months.

Ex Output:
three


Ex Input:
Orangutans are similar, with ____ observations in the wild of eating meat.

Ex Output:

no