#include <bits/stdc++.h>
using namespace std;

const double EPS = 1e-8, PI = acos(-1);

inline bool eq(double a, double b) {
  return fabs(b - a) < EPS;
}

struct Point {
  double x, y;
  Point() {}
  Point(double x, double y) : x(x), y(y) {}
  Point operator+(const Point &b) const {
    return Point(x + b.x, y + b.y);
  }
  Point operator-(const Point &b) const {
    return Point(x - b.x, y - b.y);
  }
  Point operator*(const double b) const {
    return Point(x * b, y * b);
  }
  Point operator*(const Point &b) const {
    return Point(x * b.x - y * b.y, x * b.y + y * b.x);
  }
  Point operator/(const double b) const {
    return Point(x / b, y / b);
  }
  bool operator<(const Point &b) const {
    return x != b.x ? x < b.x : y < b.y;
  }
  bool operator==(const Point &b) const {
    return eq(x, b.x) && eq(y, b.y);
  }
  double norm() {
    return x * x + y * y;
  }
  double arg() {
    return atan2(x, y);
  }
  double abs() {
    return sqrt(norm());
  }
  Point rotate(double theta) {
    return Point(cos(theta) * x - sin(theta) * y, sin(theta) * x + cos(theta) * y);
  }
  Point rotate90() {
    return Point(-y, x);
  }
  friend ostream &operator<<(ostream &os, Point &p) {
    return os << "(" << p.x << "," << p.y << ")";
  }
  friend istream &operator>>(istream &is, Point &a) {
    return is >> a.x >> a.y;
  }
};

double cross(const Point &a, const Point &b) {
  return a.x * b.y - a.y * b.x;
}

double dot(const Point &a, const Point &b) {
  return a.x * b.x + a.y * b.y;
}

struct Line {
  Point a, b;

  Line(){};

  Line(Point a, Point b) : a(a), b(b){};

  friend ostream &operator<<(ostream &os, Line &p) {
    return os << "(" << p.a.x << "," << p.a.y << ") to (" << p.b.x << "," << p.b.y << ")";
  }

  friend istream &operator>>(istream &is, Line &a) {
    return is >> a.a.x >> a.a.y >> a.b.x >> a.b.y;
  }
};

Point Projection(const Line &l, const Point &p) {
  double t = dot(p - l.a, l.a - l.b) / (l.a - l.b).norm();
  return l.a + (l.a - l.b) * t;
}
Point Reflection(const Line &l, const Point &p) {
  return p + (Projection(l, p) - p) * 2.0;
}

int main() {
  Line l;
  Point r;
  while (cin >> l >> r) {
    Point p = Reflection(l, r);
    printf("%.10f %.10f\n", p.x, p.y);
  }
}