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: guitar part 
Words: inlays, concerned, string, notes, fret

Ex Output:
concerned


Ex Input:
Category: employment activity 
Words: replace, ice, fire, ban, hire

Ex Output:
ice


Ex Input:
Category: police punishment 
Words: prison, penalty, fine, jail, detailed

Ex Output:

detailed