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: food 
Words: frank, entree, goodies, concise, wiener

Ex Output:
concise


Ex Input:
Category: window material 
Words: metal, handle, dish, glass, vinyl

Ex Output:
dish


Ex Input:
Category: boats 
Words: deck, lifeline, tko, gunwale, rudder

Ex Output:

tko