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.

Input: Consider Input: plain, mansion, condominium, squashed, flat

Output: plain


Input: Consider Input: streamline, sustainability, private, firm, stiff

Output: stiff


Input: Consider Input: universal, general, cadet, sergeant, colonel


Output: universal