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:
variety, medium, endure, size, fair

Ex Output:
endure


Ex Input:
hire, flame, pay, fire, ban

Ex Output:
flame


Ex Input:
cool, fire, scold, earth, combustion

Ex Output:

scold