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

Example Input: flaxen, fair, sunny, cool, pale
Example Output: sunny

Example Input: color, medium, fair, warm, size
Example Output:
warm