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: construction 
Words: digger, concrete pourer, crane, derrick, excavator

Ex Output:
derrick


Ex Input:
Category: boxing terminology 
Words: deck, corner, blocking, call, box

Ex Output:
call


Ex Input:
Category: aesthetic characteristic 
Words: level, fine, high quality, acceptable, hot

Ex Output:

acceptable