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: aesthetic characteristic 
Words: medium, just, light, ghostly, fair

Output: just


Input: Consider Input: Category: measurement unit 
Words: centimeter, leg, mile, meter, foot

Output: leg


Input: Consider Input: Category: physical activity 
Words: pig, stoop, push, duck, get down


Output: pig