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, variety, color, fair, light
Example Output: 70

Example Input: Category: shady activities 
Words: wrongful, fudge, unwarranted, fix, cake
Example Output: cake

Example Input: Category: emotional status 
Words: sad, fret, anxious, headstock, crying
Example Output:
headstock