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.

Example Input: Category: construction 
Words: hoist, tackle, digger, excavator, crane
Example Output: tackle

Example Input: Category: store status 
Words: beside, finished for the day, running., close, gated
Example Output: beside

Example Input: Category: secretary duty 
Words: folder, errands, correspondence, file, schedule appointments
Example Output:
folder