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.

Input: Consider Input: Manatees swim ____ to six miles per hour.

Output: two

Input: Consider Input: Comprehension is the second of the ____ elements of the informed consent process.

Output: three

Input: Consider Input: Nucleotides only require ____ phosphorylations.
Output: two