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

Ex Input:
Flexible shapes are also shapes which have _ obvious way of being attacked.

Ex Output:
no

Ex Input:
Mature cysts have _ nuclei while the immature have two.

Ex Output:
four

Ex Input:
Dogs can begin gundog training as early as _ months of age.

Ex Output:
six