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: ugly, absorption, vitamin c, fat, thin
Example Output: vitamin c

Example Input: order office supplies, sort mail, file, program, type
Example Output: program

Example Input: duplex, studio, flat, paved, squashed
Example Output:
paved