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 rigidity 
Words: tough, taut, rough, amalgamated, firm

Ex Output:
amalgamated


Ex Input:
Category: aesthetic characteristic 
Words: fair, size, medium, dishonest, level

Ex Output:
dishonest


Ex Input:
Category: shady activities 
Words: cake, unwarranted, invent, lie, fudge

Ex Output:

cake