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.

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

Ex Output:
history


Ex Input:
flat, level, mansion, smooshed, elevation

Ex Output:
mansion


Ex Input:
smear, lie, pudding, invent, fudge

Ex Output:

pudding