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: secretary duty 
Words: support, type, file, software, answer
Example Output: software

Example Input: Category: food 
Words: sausage, loyalty, grub, frank, provision
Example Output: loyalty

Example Input: Category: measurement unit 
Words: centimeter, leg, mile, meter, foot
Example Output:
leg