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:
blue, current, drink, water, prompt

Ex Output:
prompt


Ex Input:
fudge, mangle, falsehood, falsification, cake

Ex Output:
cake


Ex Input:
ok, dishonest, fair, pale, unjust

Ex Output:

pale