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

Ex Input:
Porcine insulin has _ different amino acid and bovine insulin has three different amino acids.

Ex Output:
one

Ex Input:
Reds mature well for six to _ years.

Ex Output:
eight

Ex Input:
Mediators generateed during mast cell activation are derived in _ ways.

Ex Output:
three