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: activity 
Words: divide, croquet, fritter, squander, spend
Example Output: croquet

Example Input: Category: police punishment 
Words: penalty, fine, money, arrest, alright
Example Output: alright

Example Input: Category: ocean 
Words: current, history, wave, jetstream, whirlpool
Example Output:
history