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:
fish, stingray, climbing, trap, hiking

Ex Output:
stingray


Ex Input:
pie, fried, misuse, fritter, cake

Ex Output:
misuse


Ex Input:
blt, group, club, lettuce, roll

Ex Output:

group