A1321.[COCI-2007_2008-contest1]#1 CETVRTA

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 100
0.

Output the coordinates of the fourth vertex of the rectangle.