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: fawn, love, calf, flatter, identity
Example Output: calf

Example Input: crane, ostrich, davit, dump truck, pelican
Example Output: dump truck

Example Input: deck, ring, head, knockout, glove
Example Output:
head