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: Measles usually begin with cold-like symptoms followed by a high fever and a rash ____ days later.
Example Output: three

Example Input: Sin divides minds into ____ halves.
Example Output: two

Example Input: Earth is divided into ____ general layers.
Example Output:
three