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: sergeant, general, standard, plain, ordinary
Example Output: sergeant

Example Input: fly, grasshopper, walk, waggle, train
Example Output: train

Example Input: panel, translucent fabric, spatula, metal, glass
Example Output:
spatula