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:
fine, level, pretty, mad, detailed

Ex Output:
mad


Ex Input:
ice, let go, fire, sack, replace

Ex Output:
ice


Ex Input:
doe, identity, swoon, fawn, social

Ex Output:

doe