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: kitchenware 
Words: metal, glass, knifer, dish, cup

Ex Output:
metal


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

Ex Output:
hamburger


Ex Input:
Category: computers 
Words: software, file, answer, folder, keys

Ex Output:

answer