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: davit, hoist, crane, sandpiper, davit
Example Output: davit

Example Input: fish, stingray, climbing, trap, hiking
Example Output: stingray

Example Input: file, reception, order office supplies, prepare, keys
Example Output:
keys