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: type of sandwich 
Words: club, roll, doorstep, discothek, toast

Ex Output:
discothek


Ex Input:
Category: corporate 
Words: corporation, firm, alignment, taut, leverage

Ex Output:
taut


Ex Input:
Category: window material 
Words: woodwork, bowl, lead, spyhole, glass

Ex Output:

bowl