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: fret, worried, chord, notes, headstock

Output: worried


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

Output: nervous


Input: Consider Input: common, combined, synergy, inflexible, firm


Output: inflexible