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:
Beryllium has ____ protons and four electrons.

Ex Output:
four


Ex Input:
Avian kidneys have ____ kinds of nephrons.

Ex Output:
two


Ex Input:
Space is experienced as extended in ____ dimensions.

Ex Output:

three