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: Traffic lights have ____ colors.
Example Output: three

Example Input: Some botanists recognise ____ botanical varieties.
Example Output: two

Example Input: Tin exists in ____ allotropes, white and gray tin.
Example Output:
two