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:
summer, roll, plummet, fall, exercise

Ex Output:
summer


Ex Input:
smooshed, horizontal, condominium, flat, valley

Ex Output:
condominium


Ex Input:
delayed, belated, prompt, current, jetstream

Ex Output:

jetstream