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: type of sandwich 
Words: club, roll, doorstep, discothek, toast
Example Output: discothek

Example Input: Category: computers 
Words: errands, file, download, text, folder
Example Output: errands

Example Input: Category: type of rigidity 
Words: resistant, unyielding, rigged, firm, alignment
Example Output:
alignment