Problem: For given three points p1, p2, p, find the reflection point x of p onto p1p2.

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Constraints

* 1 ≤ q ≤ 1000
* -10000 ≤ xi, yi ≤ 10000
* p1 and p2 are not identical.

Input


xp1 yp1 xp2 yp2
q
xp0 yp0
xp1 yp1
...
xpq−1 ypq−1


In the first line, integer coordinates of p1 and p2 are given. Then, q queries are given for integer coordinates of p.

Output

For each query, print the coordinate of the reflection point x. The output values should be in a decimal fraction with an error less than 0.00000001.

Examples

Input

0 0 2 0
3
-1 1
0 1
1 1


Output

-1.0000000000 -1.0000000000
0.0000000000 -1.0000000000
1.0000000000 -1.0000000000


Input

0 0 3 4
3
2 5
1 4
0 3


Output

4.2400000000 3.3200000000
3.5600000000 2.0800000000
2.8800000000 0.8400000000

Solution (in CPP):

Solution:
#include <bits/stdc++.h>

struct Point{
  double x,y;

  Point(double x = 0,double y = 0) : x(x), y(y) {}

  Point operator + (const Point &p)const{
    return Point(x + p.x , y + p.y);
  }

  Point operator - (const Point &p)const{
    return Point(x - p.x , y - p.y);
  }

  Point operator * (const double &k)const{
    return Point(x * k , y * k);
  }

  Point operator / (const double &k)const{
    return Point(x / k , y / k);
  }
  double norm(){
    return x*x + y*y;
  }
  double dot(const Point &p)const{
    return x*p.x + y*p.y;
  }
};
typedef Point Vector;

struct Segment{
  Vector s, t;

  Segment(){}
  Segment(Vector s, Vector t) : s(s), t(t) {}

  Point Projection(Point &p){
    Vector base = t - s;
    double t = (p-s).dot(base) / base.norm();
    return s + base*t;
  }
  Point Reflection(Point &p){
    return p + (Projection(p) - p) * 2.0;
  }
};

int main(){
  Point p1, p2, p3;
  int q;

  std::cin >> p1.x >> p1.y >> p2.x >> p2.y >> q;
  Segment s = Segment(p1, p2);
  for(int i = 0 ; i < q ; i++){
    std::cin >> p3.x >> p3.y;
    Point p = s.Reflection(p3);
    printf("%.10f %.10f\n",p.x ,p.y);
  }

  return 0;
}