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:
hoist, sandpiper, crane, swallow, heron

Ex Output:
hoist


Ex Input:
upraise, crane, excavator, digger, hoist

Ex Output:
hoist


Ex Input:
activity, content, ecstatic, specialty, clothing

Ex Output:

ecstatic