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:
backward, south, down, forward, shameful

Ex Output:
shameful


Ex Input:
swim, leaves, fall, hiems, spring

Ex Output:
swim


Ex Input:
tide, current, flow, detests, whirlpool

Ex Output:

detests