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:
Lunar eclipses occur every ____ months, on average.

Ex Output:
six


Ex Input:
Most insects have two antennae, six legs, and ____ wings.

Ex Output:
four


Ex Input:
Viruses exist in ____ distinct states.

Ex Output:

two