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: spend, divide, apple, whittle, fritter
Example Output: apple

Example Input: Category: food 
Words: provision, frank, hot dog, goodies, harsh
Example Output: harsh

Example Input: Category: animal 
Words: spider, beetle, glide, fly, cockroach
Example Output:
glide