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<cstdio>
using namespace std;
struct point{
public:
    double x,y;
    point(double x=0,double y=0):x(x),y(y){}
    point operator +(point a){
        return point(x+a.x,y+a.y);
    }
    point operator -(point a){
        return point(x-a.x,y-a.y);
    }
    point operator *(double a){
        return point(x*a,y*a);
    }
    double operator *(point a){
        return x*a.x+y*a.y;
    }
    void print(){
        printf("%.10lf %.10lf\n",x,y);
    }
};
struct segment{
    point p1,p2,base;
    segment(point a,point b){
        p1=a,p2=b,base=b-a;
    }
};
point project(segment s,point p){
    double r=(p-s.p1)*s.base/(s.base*s.base);
    return (s.p1+s.base*r);
}
int main(){
    int n;
    double x1,y1,x2,y2;
    point p;
    scanf("%lf%lf%lf%lf",&x1,&y1,&x2,&y2);
    segment s(point(x1,y1),point(x2,y2));
    scanf("%d",&n);
    for(int i=1;i<=n;++i){
        scanf("%lf%lf",&p.x,&p.y);
        ((project(s,p)-p)*2+p).print();
    }
    return 0;
}