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 <bits/stdc++.h>
using namespace std;

#define EPS (1e-10)
#define equals(a,b) (fabs((a)-(b))<EPS)

class Point {
public:
    double x,y;

    Point(double x=0,double y=0):x(x),y(y) {}
    Point operator + (Point p) {return Point(x+p.x,y+p.y);}
    Point operator - (Point p) {return Point(x-p.x,y-p.y);}
    Point operator * (double a) {return Point(a*x,a*y);}
    Point operator / (double a) {return Point(x/a,y/a);}

    double abs() {return sqrt(norm());}
    double norm() {return x*x+y*y;}

    bool operator<(const Point &p) const {
        return x!=p.x ? x<p.x : y<p.y;
    }
    bool operator==(const Point &p) const {
        return fabs(x-p.x)<EPS && fabs(y-p.y)<EPS;
    }
};

struct Segment {
    Point p1,p2;
};

typedef Point Vector;

double dot(Vector a,Vector b) {
    return a.x*b.x+a.y*b.y;
}

Point project(Segment s,Point p) {
    Vector base=s.p2-s.p1;
    double r=dot(p-s.p1,base)/base.norm();
    return s.p1+base*r;
}

Point reflect(Segment s,Point p) {
    return p+(project(s,p)-p)*2.0;
}

int main(void) {
    Segment s;
    cin>>s.p1.x>>s.p1.y>>s.p2.x>>s.p2.y;
    int q;
    cin>>q;
    while(q) {
        Point p;
        cin>>p.x>>p.y;
        Point ans=reflect(s,p);
        printf("%.10f %.10f\n",ans.x,ans.y);
        q--;
    }
    return 0;
}