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:
tone, just, equitable, fair, unprejudiced

Ex Output:
tone


Ex Input:
tackle, davit, swift, crane, steam roller

Ex Output:
steam roller


Ex Input:
bike, bats, bird, fly, fish

Ex Output:

bike