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:
fly, swim, waggle, soar, wave

Ex Output:
waggle


Ex Input:
fawn, love, calf, flatter, identity

Ex Output:
calf


Ex Input:
winch, egret, crane, digger, neck

Ex Output:

digger