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: hoist, neck, concrete pourer, hummingbird, crane
Example Output: concrete pourer

Example Input: mallet, winch, parrot, winch, crane
Example Output: winch

Example Input: excited, content, merchandise, substance, program
Example Output:
excited