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: flap, glide, fly, train, bats
Example Output: bats

Example Input: dump truck, hoist, crane, ostrich, goose
Example Output: dump truck

Example Input: glide, fly, ant, leap, grasshopper
Example Output:
glide