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: fair, pale, 70, clime, tangle
Example Output: pale

Example Input: big boned, vitamin c, fiber, sugar, fat
Example Output: big boned

Example Input: sort mail, keys, motherboard, format, file
Example Output:
sort mail