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: secretary duty 
Words: file, organize, schedule appointments, answer calls, program
Example Output: program

Example Input: Category: baby animals 
Words: follow, colt, fawn, cub, calf
Example Output: follow

Example Input: Category: temperature 
Words: ethical, hot, cool, mild, chill
Example Output:
ethical