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

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

Ex Output:
four

Ex Input:
Degradation is a result of _ simultaneous processes.

Ex Output:
two

Ex Input:
Fats are the most concentrated source of food energy, supplying _ calories per from.

Ex Output:
nine