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:
fine, level, pretty, mad, detailed

Ex Output:
mad


Ex Input:
current, wave, whirlpool, sea, data sets

Ex Output:
data sets


Ex Input:
fritter, dunker, spend, doughnut, apple

Ex Output:

spend