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

<image>

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>
 
using namespace std;
 
#define EPS 1e-10
#define equal(a,b) (fabs(a-b) < EPS)

struct Point{
  double x,y;

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

istream &operator >> (istream &is,Point &p){ 
  return is >> p.x >> p.y;
}

typedef Point Vector;

struct Line{
  Point s,t;
  Line(){}
  Line(Point s,Point t) : s(s),t(t) {}
};

Point projection(Line l,Point p){
  Vector b = l.t-l.s;
  double t = dot(p-l.s,b)/norm(b);
  return l.s+b*t;
}

Point reflection(Line l,Point p){
  return p+(projection(l,p)-p)*2.0;
}

int main(){
  Line l;
  int Q;
  Point p;
  cin >> l.s >> l.t >> Q;
  while(Q--){
    cin >> p;
    Point p2 = reflection(l,p);
    printf("%.10f %.10f\n",p2.x,p2.y);
  }
  return 0;
}