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: aesthetic characteristic 
Words: 70, pale, fair, light, milky
Example Output: 70

Example Input: Category: employment activity 
Words: replace, ice, fire, ban, hire
Example Output: ice

Example Input: Category: police punishment 
Words: jail, money, level, penalty, fine
Example Output:
level