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: Neuroblasts delaminate in five waves spanning approximately ____ hours.
Example Output: three

Example Input: Blood Parrots are a hybrid of ____ Cichlids species.
Example Output: two

Example Input: Pigeons are sexually mature at about ____ months of age.
Example Output:
six