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: bike, flap, fly, walk, wave

Output: walk


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

Output: stiff


Input: Consider Input: prepare, file, folder, make coffee, reception


Output: folder