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:
variety, medium, endure, size, fair

Ex Output:
endure


Ex Input:
fret, nervous, board, fingerpick, jack

Ex Output:
nervous


Ex Input:
common, concerted, solid, firm, sustainability

Ex Output:

solid