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: dangle, wave, eagle, fly, leap
Example Output: wave

Example Input: windlass, excavator, crane, hummingbird, steam roller
Example Output: hummingbird

Example Input: fawn, follow, identity, hatchling, pester
Example Output:
hatchling