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:
fret, nervous, board, fingerpick, jack

Ex Output:
nervous


Ex Input:
crane, pelican, egret, hummingbird, upraise

Ex Output:
upraise


Ex Input:
beetle, fly, soar, bus, car

Ex Output:

beetle