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: condominium, duplex, studio, flat, level
Example Output: level

Example Input: hunt, whale, shark, fish, mice
Example Output: hunt

Example Input: crane, swift, heron, steam roller, sandpiper
Example Output:
steam roller