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:
social, love, fawn, follow, kid

Ex Output:
kid


Ex Input:
lifeline, knockout, deck, punch, tko

Ex Output:
lifeline


Ex Input:
resistant, alignment, firm, sustainability, common

Ex Output:

resistant