#include<iostream>
#include<math.h>
using namespace std;
int main()
{
	double a0,b0,a1,b1,a2,b2,a3,b3,a4,b4;
	while(1)
	{
		cin>>a0>>b0>>a1>>b1>>a2>>b2>>a3>>b3;
		a4=a3+a0-a1;
		b4=b3-sqrt((a1-a0)*(a1-a0)+(b1-b0)*(b1-b0)-(a3-a4)*(a3-a4));
		printf("%0.3lf %0.3lf\n",a4,b4);
	}
	return 0;
}