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:
Elephants rise ____ inches when they inhale.

Ex Output:
two


Ex Input:
Pyrimidines contain ____ ring and purines contain two rings.

Ex Output:
one


Ex Input:
Japan also has ____ levels of education.

Ex Output:

three