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:
heat, hire, burn, air, fire

Ex Output:
hire


Ex Input:
motherboard, schedule appointments, schedule, file, type

Ex Output:
motherboard


Ex Input:
milky, 70, size, even, fair

Ex Output:

70