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: Elephants also have four molars, ____ on the top and one on the bottom on both sides of the mouth.
Example Output: one

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

Example Input: Compound machines contain ____ or more simple machines.
Example Output:
two