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:
fearful, content, substance, program, thing

Ex Output:
fearful


Ex Input:
cold, deal, make the grade, unprejudiced, fair

Ex Output:
unprejudiced


Ex Input:
concerned, fret, emotional upsets, emotional supports, neck

Ex Output:

neck