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: police punishment 
Words: jail, fine, bright, arrest, flyaway

Ex Output:
bright


Ex Input:
Category: social gathering 
Words: convention, club, discothek, hamburger, dance hall

Ex Output:
hamburger


Ex Input:
Category: corporate 
Words: united, synergy, leverage, inflexible, firm

Ex Output:

inflexible