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: Kinetic energy consists of ____ types of energies.
Example Output: three

Example Input: Binary distillation is a separation of only ____ chemicals.
Example Output: two

Example Input: Apparent competition can occur when ____ species share a predator.
Example Output:
two