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: personal characteristic 
Words: assured, refreshing, unruffled, cool, positive

Ex Output:
refreshing


Ex Input:
Category: window material 
Words: glass, coating, panel, spatula, lead

Ex Output:
spatula


Ex Input:
Category: emotional status 
Words: ground, down, melancholy, emotional state, shameful

Ex Output:

ground