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: bend, jog, get down, duck, pig

Ex Output:
pig


Ex Input:
Category: social gathering 
Words: club, bar, dance hall, discothek, roll

Ex Output:
roll


Ex Input:
Category: weather 
Words: endure, size, warm, fair, luke

Ex Output:

size