Mirko needs to choose four points in the plane so that they form a rectangle with sides parallel to the
axes. He has already chosen three points and is confident that he hasn't made a mistake, but is having
trouble locating the last point. Help him.
Each of the three points already chosen will be given on a separate line. All coordinates will be integers
between 1 and 1000.
Output the coordinates of the fourth vertex of the rectangle.
Sample Input #1
Sample Output #1
Sample Input #2
Sample Output #2