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: replace, fire, retire, air, remove
Example Output: air

Example Input: tide, belated, signal, current, jetstream
Example Output: belated

Example Input: iguana, wrestle, climbing, fish, canyoning
Example Output:
iguana