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.

Input: Consider Input: acceptable, fine, comfortable, pretty, well

Output: pretty


Input: Consider Input: fret, notes, emotional state, bored, emotional upsets

Output: notes


Input: Consider Input: current, flow, history, signal, jetstream


Output: history