remove id this command is issued to remove any students from her/his position regardless of where they are. If he/she is on the stand, the same action as remove x y will occur. If such person cannot be found, the system should print out “There is no need to worry for that person because they have been gone for a long time.”. If there is no one attends the stand, print out “No people attend this event, SO SAD”. search id this command is issued to search a given ID and it will return the list that this ID exists. If this ID is on the stand, the row and column must be identified. For example, search 10 print out “10 = stand 3 5” search 12 print out “12 = art”.