In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

Example Input: Hoatzin has typical foot with _ toes forwards and one backwards.
Example Output: three

Example Input: Some people routinely sleep only _ hours a night but feel fine during the day.
Example Output: four

Example Input: Durable goods are new or used items generally with a normal life expectancy of _ years or more.
Example Output:
three