Given a set of five words, generate the word from the set that does not belong (i.e. is the least relevant) with the other words. Words are separated by commas.

Ex Input:
relaxed, warm, assured, level, cool

Ex Output:
warm

Ex Input:
dump truck, tackle, crane, duck, mallet

Ex Output:
dump truck

Ex Input:
left, emotional state, sad, emotional upsets, down

Ex Output:
left