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.

Input: Consider Input: Category: window material 
Words: glass, coating, panel, spatula, lead

Output: spatula


Input: Consider Input: Category: mode of transportation 
Words: spider, fly, train, jog, car

Output: spider


Input: Consider Input: Category: baby animals 
Words: deer, flatter, bambi, fawn, calf


Output: flatter