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:
deck, tko, rudder, level, corner

Ex Output:
rudder


Ex Input:
blue, current, drink, water, prompt

Ex Output:
prompt


Ex Input:
down, kind, opposite of up, lower, ground

Ex Output:

kind