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:
tackle, davit, swift, crane, steam roller

Ex Output:
steam roller


Ex Input:
keys, file, download, folder, type

Ex Output:
type


Ex Input:
pretty, comfortable, decent, fine, ok

Ex Output:

pretty