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.

Ex Input:
Category: physical activity 
Words: dog, push, duck, squat, jog

Ex Output:
dog


Ex Input:
Category: season 
Words: winter, roll, spring, hiems, fall

Ex Output:
roll


Ex Input:
Category: physical activity 
Words: swim, push, horse, dodge, duck

Ex Output:

horse