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: corporate 
Words: corporation, firm, alignment, taut, leverage
Example Output: taut

Example Input: Category: weather 
Words: luke, equitable, clime, fair, mild
Example Output: equitable

Example Input: Category: secretary duty 
Words: fax, program, file, make coffee, answer
Example Output:
program