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 <cmath>
using namespace std;
#define db double
struct point{
    db x,y;
    point(){}
    point(db x,db y):x(x),y(y){}
    point operator + (point B){ return point(x+B.x,y+B.y); }
    point operator - (point B){ return point(x-B.x,y-B.y); }
    point operator * (db k){ return point(k*x,k*y); }
    db operator * (point B){ return x*B.y-y*B.x; }
    db operator ^ (point B){ return x*B.x+y*B.y; }
    bool operator < (point B){ return (y>0)!=(B.y>0)?y>0:((*this)*B)>0; }
};
db dis2(point A,point B){ return (A.x-B.x)*(A.x-B.x)+(A.y-B.y)*(A.y-B.y); }
struct line{
    point A,B;
    line(){}
    line(point A,point B):A(A),B(B){}
};
point projection(line l,point P){
    point dir=l.B-l.A; P=P-l.A;
    return dir*((P^dir)/dis2(l.A,l.B))+l.A;
}
point reflection(line l,point P){
    return projection(l,P)*2-P;
}
int main(){
    db x1,y1,x2,y2; scanf("%lf%lf%lf%lf",&x1,&y1,&x2,&y2);
    line l(point(x1,y1),point(x2,y2));
    int q; scanf("%d",&q);
    while (q--){
        db x,y; scanf("%lf%lf",&x,&y);
        point refl=reflection(l,point(x,y));
        printf("%.9f %.9f\n",refl.x,refl.y);
    }
}