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: personal characteristic 
Words: cold, positive, calm, assured, cool
Example Output: cold

Example Input: Category: fried food 
Words: croquet, dumpling, fritter, spend, patty
Example Output: spend

Example Input: Category: mode of transportation 
Words: bike, walk, fly, flutter, bus
Example Output:
walk