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:
current, wave, whirlpool, sea, data sets

Ex Output:
data sets


Ex Input:
specialty, content, angry, program, activity

Ex Output:
angry


Ex Input:
alright, fair, level, color, ghostly

Ex Output:

alright