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

Ex Input:
B cells can receive stimulation in _ ways.

Ex Output:
two

Ex Input:
Excess potassium induces larval metamorphosis in _ marine invertebrate species.

Ex Output:
four

Ex Input:
Studies show that childhood obesity is epidemic and that one in _ children is overweight.

Ex Output:
five