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:
duck, bend, ostrich, jog, stoop

Ex Output:
ostrich


Ex Input:
truss rod, pick, chord, worried, fret

Ex Output:
worried


Ex Input:
early, water, delayed, history, current

Ex Output:

water