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 <iomanip>
#include <cmath>

using namespace std;

struct Vector {
    double x, y;
    Vector(double x, double y): x(x), y(y){
    }
};

typedef Vector Point;

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

Vector operator+(const Vector& a, const Vector& b) {
    return Vector(a.x + b.x, a.y + b.y);
}
Vector operator-(const Vector& a, const Vector& b) {
    return Vector(a.x - b.x, a.y - b.y);
}
Vector operator*(const Vector& a, const double p) {
    return Vector(a.x * p, a.y * p);
}

Vector reflect(const Point& a, const Point& b, const Point& p) {
    Vector v = b - a;
    double t = dot(p - a, v) / dot(v, v);
    Vector m = a + v * t;
    return p + (m - p) * 2;
}

int main() {
    double x1, y1, x2, y2;
    cin >> x1 >> y1 >> x2 >> y2;
    Point a(x1, y1);
    Point b(x2, y2);
    int q;
    cin >> q;
    for (int i = 0; i < q; i++) {
        double x, y;
        cin >> x >> y;
        Vector ans = reflect(a, b, Point(x,y));
        cout << setprecision(8) << fixed << ans.x << " " << ans.y << endl;
    }
   
}