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;

struct Point{
    double x,y;

    Point(){}
    Point(double x,double y) : x(x),y(y) {}

    Point operator + (const Point &p)const{ return Point(x+p.x,y+p.y); }
    Point operator - (const Point &p)const{ return Point(x-p.x,y-p.y); }
    Point operator * (const double &k)const{ return Point(x*k,y*k); }
};

double dot(const Point &a,const Point &b){ return a.x*b.x+a.y*b.y; }
double norm(const Point &p){ return dot(p,p); }

struct Segment{
    Point s,t;
    Segment(){}
    Segment(Point s,Point t) : s(s),t(t) {}
};

typedef Point Vector;

Point projection(const Segment &s,const Point &p){
    Vector b = s.t-s.s;
    double t = dot(p-s.s,b)/norm(b);
    return s.s+b*t;
}

Point reflection(const Segment &s,const Point &p){
    return p+(projection(s,p)-p)*2.0;
}

int main(){
    int Q;
    Point p;
    Segment s;
    cin >> s.s.x >> s.s.y >> s.t.x >> s.t.y;
    cin >> Q;
    while(Q--){
        cin >> p.x >> p.y;
        Point q = reflection(s,p);
        printf("%.12f %.12f\n",q.x,q.y);
    }
    return 0;
}