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.

Example Input: early, water, delayed, history, current
Example Output: water

Example Input: fudge, mangle, falsehood, falsification, cake
Example Output: cake

Example Input: head, deck, gunwale, pack, crew
Example Output:
pack