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:
Pigs grow very quickly and are normally ready for sale at ____ to six months of age.

Ex Output:
four


Ex Input:
Beryllium has ____ protons and four electrons.

Ex Output:
four


Ex Input:
Whales are abundant, and some ____ species of seals are found in the area.

Ex Output:

six