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:
fire, hire, heat, inferno, earth

Ex Output:
hire


Ex Input:
wine, rum, bridge, tonic, gin

Ex Output:
bridge


Ex Input:
united, firm, unbending, rough, solid

Ex Output:

united