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<cstdio>
#include<iostream>
using namespace std;
typedef long long ll;
ll read()
{
	ll x=0,f=1;char ch=getchar();
	while(ch<'0'||ch>'9'){if(ch=='-')f=-1;ch=getchar();}
	while(ch>='0'&&ch<='9'){x=x*10+ch-'0';ch=getchar();}
	return x*f;
}
struct Point{double x,y;}p1,p2,p;
Point operator +(Point a,Point b){return (Point){a.x+b.x,a.y+b.y};}
Point operator -(Point a,Point b){return (Point){a.x-b.x,a.y-b.y};}
Point operator *(Point a,double b){return (Point){a.x*b,a.y*b};}
double dot(Point a,Point b){return a.x*b.x+a.y*b.y;}
double norm(Point a){return a.x*a.x+a.y*a.y;}
void read(Point &p){p.x=read(),p.y=read();}
void print(Point p){printf("%.10lf %.10lf\n",p.x,p.y);}
Point Project(Point p1,Point p2,Point p)
{
	Point base=p2-p1,hypo=p-p1;
	double r=dot(base,hypo)/norm(base);
	return p1+base*r;
}
Point Reflect(Point p1,Point p2,Point p)
{return p+(Project(p1,p2,p)-p)*2;}
int main()
{
	read(p1),read(p2);
	int q=read();while(q--)
		read(p),print(Reflect(p1,p2,p));
	return 0;
}