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:
windlass, excavator, crane, hummingbird, steam roller

Ex Output:
hummingbird


Ex Input:
swallow, heron, crane, flamingo, tackle

Ex Output:
tackle


Ex Input:
pastry, dunker, fritter, blow, cake

Ex Output:

blow