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: trip, jump, fall, equinox, exercise

Ex Output:
equinox


Ex Input:
Category: season 
Words: climb, equinox, summer, fall, hiems

Ex Output:
climb


Ex Input:
Category: animal 
Words: wave, fly, walk, grasshopper, spider

Ex Output:

wave