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

Output: three


Input: Consider Input: Multiplications are always ____ complemental.

Output: two


Input: Consider Input: Some helicopters can have as many as six main rotor blades, and up to ____ tail rotor blades.


Output: five