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: employment activity 
Words: recruit, replace, sack, heat, fire

Output: heat


Input: Consider Input: Category: physical activity 
Words: tumble, summer, fall, bend, lift

Output: summer


Input: Consider Input: Category: emotional status 
Words: fine, relaxed, comfortable, prime, content


Output: prime