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:
Variable stars fall into ____ major physical classifications.

Ex Output:
four


Ex Input:
Ocean has ____ life-important properties.

Ex Output:
two


Ex Input:
Most mute swans breed at age ____ and remain with the same mate for life.

Ex Output:

three