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:
Cats have five toes on their front paws, but only ____ touch the ground when walking.

Ex Output:
four


Ex Input:
Tobacco companies account for ____ of the five biggest billboard advertisers in the country.

Ex Output:
four


Ex Input:
Nature has a nearly ____ billion year history of testing the materials and products and processes.

Ex Output:

four