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

Ex Input:
Crustaceans have _ major body parts .

Ex Output:
three


Ex Input:
Plants have many white flowers with _ petals, giving the plant a white, flat-topped appearance.

Ex Output:
four


Ex Input:
Crystal growth is affected by _ naturally occurring factors.

Ex Output:

four