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: down, emotional state, loveful, ashamed, flat

Output: flat


Input: Consider Input: Category: ocean 
Words: current, data sets, main, sea, wave

Output: data sets


Input: Consider Input: Category: bird 
Words: parrot, tackle, winch, crane, mallet


Output: tackle