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.

Input: Consider Input: Category: emotional status 
Words: content, hearing, fine, happy, alert

Output: hearing


Input: Consider Input: Category: bird 
Words: digger, heron, crane, mallet, sandpiper

Output: digger


Input: Consider Input: Category: outdoor sport activity 
Words: hike, tiger, swim, camp, fish


Output: tiger