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:
nervous, frustrated, fret, jack, concerned

Ex Output:
jack


Ex Input:
clan, place, club, community, toast

Ex Output:
toast


Ex Input:
fat, angular momentum, sugars, heavy, iron

Ex Output:

angular momentum