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.

Example Input: Aardvarks have ____ toes on the front feet and five toes on their back feet.
Example Output: four

Example Input: Background color can be a transition of ____ colors.
Example Output: two

Example Input: Teleportation is performed if the ____ detectors simultaneously register photons.
Example Output:
two