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:
fire, instruct, inferno, retire, scold

Ex Output:
inferno


Ex Input:
concrete pourer, winch, excavator, hoist, crane

Ex Output:
hoist


Ex Input:
calm, assured, cool, icy, popular

Ex Output:

icy