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<iostream>
#include<cstdio>
#include<cstring>
#include<cmath>
#define eps 1e-9
using namespace std;
struct point{
	double x,y;
	void read(){scanf("%lf%lf",&x,&y);}
	void write(){printf("%.9f %.9f\n",x,y);}
	point(double X=0.0,double Y=0.0):x(X),y(Y){}
	point operator +(const point a)const{return point(x+a.x,y+a.y);}
	point operator -(const point a)const{return point(x-a.x,y-a.y);}
	point operator *(double a)const{return point(x*a,y*a);}
	point operator /(double a)const{return point(x/a,y/a);} 
};
double dis(point a){return sqrt(a.x*a.x+a.y*a.y);}
double dot(point a,point b){return a.x*b.x+a.y*b.y;}
double cross(point a,point b){return a.x*b.y-a.y*b.x;}

point p1,p2;
int main()
{
	int n;
	p1.read();p2.read();
	scanf("%d",&n);
	for(int i=1;i<=n;i++)
	{
		point p;
		p.read();
		double len=dot(p2-p1,p-p1)/dis(p2-p1);
		((p1+(p2-p1)/dis(p2-p1)*len)*2-p).write();
	}
	return 0;
}