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:
fat, obese, iron, sugar, sugars

Ex Output:
obese


Ex Input:
order office supplies, sort mail, file, program, type

Ex Output:
program


Ex Input:
walk, run, flutter, fly, waggle

Ex Output:

flutter