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: measurement unit 
Words: meter, inch, foot, heel, pound

Output: heel


Input: Consider Input: Category: aesthetic characteristic 
Words: medium, just, light, ghostly, fair

Output: just


Input: Consider Input: Category: weather 
Words: raining, make the grade, balanced, fair, 70


Output: balanced