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: type of rigidity 
Words: solid, leverage, hard, unbending, firm

Ex Output:
leverage


Ex Input:
Category: poker 
Words: hearts, chips, punch, deck, board

Ex Output:

punch