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

Ex Input:
Communion is that which is shared between the _ persons of the Holy Trinity.

Ex Output:
three


Ex Input:
Induction also operates early in development, even before the _ layered embryo forms.

Ex Output:
three


Ex Input:
Neurofibromatosis appears in _ forms.

Ex Output:

two