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: current, dastards, prompt, course, timely
Example Output: course

Example Input: danish, fried, lollygag, pastry, fritter
Example Output: lollygag

Example Input: opposite of up, down, ground, emotional upsets, forward
Example Output:
emotional upsets