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:
content, sad, panicked, item, happy

Ex Output:
item


Ex Input:
regular, general, captain, ubiquitous, popular

Ex Output:
captain


Ex Input:
smooth, flat, hill, plain, mansion

Ex Output:

mansion