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: clothing, content, service, substance, ecstatic
Example Output: ecstatic

Example Input: crane, ostrich, davit, dump truck, pelican
Example Output: dump truck

Example Input: spatula, glass, plastic, plate, dish
Example Output:
plastic