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: outdoor sport activity 
Words: hiking, climbing, mice, fish, row

Ex Output:
mice


Ex Input:
Category: animal 
Words: bird, fish, fly, drive, eagle

Ex Output:
drive


Ex Input:
Category: emotional status 
Words: excited, ecstatic, tools, content, angry

Ex Output:

tools