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, blaze, water, flame, recruit

Ex Output:
recruit


Ex Input:
galley, head, suits, deck, dock

Ex Output:
suits


Ex Input:
positive, persistent, mild, cool, unflappalbe

Ex Output:

mild