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:
recruit, replace, sack, heat, fire

Ex Output:
heat


Ex Input:
cool, unruffled, funny, chill, ethical

Ex Output:
chill


Ex Input:
pick, fret, amp, bored, neck

Ex Output:

bored