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: Raindrops produce ____ types of sound underwater.
Example Output: two

Example Input: Coyotes typically have ____ toes on each forefoot and four toes on each hind foot.
Example Output: five

Example Input: Resonant converters are another example of ____ voltage switching.
Example Output:
zero