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: animal 
Words: stingray, horse, iguana, wrestle, fish

Ex Output:
wrestle


Ex Input:
Category: outdoor sport activity 
Words: hiking, climbing, mice, fish, row

Ex Output:
mice


Ex Input:
Category: temperature 
Words: cool, unflappalbe, freezing, warm, chill

Ex Output:

unflappalbe