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: social gathering 
Words: group, clan, team, club, doorstep

Output: doorstep


Input: Consider Input: Category: widespread 
Words: boring, common, soldier, general, average

Output: soldier


Input: Consider Input: Category: secretary duty 
Words: format, correspondence, make coffee, errands, file


Output: format