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:
International mail consists of ____ categories of mail.

Ex Output:
three


Ex Input:
Elephants give birth to ____ calf every four to nine years on average.

Ex Output:
one


Ex Input:
Most museums keep between one and ten percent of their collections on display at any ____ time.

Ex Output:

one