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:
Tuberculosis develops in ____ stages.

Ex Output:
two


Ex Input:
Cockroaches have six legs, ____ antennae and some have wings.

Ex Output:
two


Ex Input:
Exposure can occur in ____ general ways, ingestion, skin contact and inhalation.

Ex Output:

three