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: physical activity 
Words: tumble, summer, fall, bend, lift

Ex Output:
summer


Ex Input:
Category: aesthetic characteristic 
Words: hot, there, detailed, fine, probation

Ex Output:
probation


Ex Input:
Category: emotional status 
Words: bright, detached, comfortable, relaxed, fine

Ex Output:

bright