Problem G
Fourth Point!!
Input: standard input
Output: standard output
Time Limit: 2 seconds
Memory Limit: 32 MB

Given are the (x, y) coordinates of the endpoints of two adjacent sides of a parallelogram. Find the (x, y) coordinates of the fourth point.

Input

Each line of input contains eight floating point numbers: the (x, y) coordinates of one of the endpoints of the first side followed by the (x, y) coordinates of the other endpoint of the first side, followed by the (x, y) coordinates of one of the endpoints of the second side followed by the (x, y) coordinates of the other endpoint of the second side. All coordinates are in meters, to the nearest mm. All coordinates are between -10000 and +10000. Input is terminated by end of file.

Output

For each line of input, print the (x, y) coordinates of the fourth point of the parallelogram in meters, to the nearest mm, separated by a single space.

Sample Input
0.000 0.000 0.000 1.000 0.000 1.000 1.000 1.000
1.000 0.000 3.500 3.500 3.500 3.500 0.000 1.000
1.866 0.000 3.127 3.543 3.127 3.543 1.412 3.145

Sample Output
1.000 0.000
-2.500 -2.500
0.151 -0.398

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(World Finals Warm-up Contest, Problem Source: University of Alberta Local Contest)

“You don’t get a rank in a contest if you don’t solve any problem. So there must be a Problem

which can be solved by almost every team.”