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: drop, fall, leaves, bend, exercise

Ex Output:
leaves


Ex Input:
Category: weather 
Words: 70, mild, fair, dishonest, clime

Ex Output:
dishonest


Ex Input:
Category: employment activity 
Words: combustion, fire, instruct, praise, let go

Ex Output:

combustion