Given a category and a set of five words, find the word from the set that does not belong (i.e. is the least relevant) with the other words in the category. Words are separated by commas.

Ex Input:
Category: activity 
Words: fritter, waste, pie, waste away, lollygag

Ex Output:
pie


Ex Input:
Category: direction 
Words: down, backward, up, downward, shameful

Ex Output:
shameful


Ex Input:
Category: police punishment 
Words: high quality, fine, jail, custody, flyaway

Ex Output:

high quality