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:
fly, grasshopper, walk, waggle, train

Ex Output:
train


Ex Input:
level, smooth, flat, lined, elevation

Ex Output:
level


Ex Input:
fine, level, neat, there, wispy

Ex Output:

wispy