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:
run, bats, fly, flutter, spider

Ex Output:
flutter


Ex Input:
cupcake, fudge, tart, smear, cream

Ex Output:
smear


Ex Input:
loosen, cream, unlicensed, smear, fudge

Ex Output:

cream