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: hiking, stingray, shark, fish, tiger
Example Output: hiking

Example Input: falsification, fib, invent, fudge, cupcake
Example Output: cupcake

Example Input: beside, nearer, close, locked, nearest
Example Output:
locked