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: construction 
Words: digger, concrete pourer, crane, derrick, excavator

Output: derrick


Input: Consider Input: Category: social gathering 
Words: club, bar, dance hall, discothek, roll

Output: roll


Input: Consider Input: Category: geographical property 
Words: flat, hill, townhome, horizontal, plain


Output: townhome