Given a category and a set of five words, find the word from the set that does not belong (i.e. is the least relevant) with the other words in the category. Words are separated by commas.

Input: Consider Input: Category: type of sandwich 
Words: club, roll, doorstep, discothek, toast

Output: discothek


Input: Consider Input: Category: physical property 
Words: fat, area, ugly, capacitance, calcium

Output: calcium


Input: Consider Input: Category: outdoor sport activity 
Words: hiking, fish, canoe, horse, wrestle


Output: horse