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:
doughnut, fritter, fried, pie, seperate

Ex Output:
seperate

Ex Input:
clime, level, cool, tone, fair

Ex Output:
clime

Ex Input:
mallet, bend, duck, ostrich, pig

Ex Output:
bend