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>
#include <utility>
#include <vector>
#include <complex>
#include <cmath>

using namespace std;

static const double EPS=1e-12;
static const double INF=1e24;

using Point=complex<double>;
using Plane=vector<Point>;

bool operator<(const Point &a, const Point &b) {
    return real(a)!=real(b)? real(a)<real(b) : imag(a)<imag(b);
}

double cross_prod(const Point &a, const Point &b) {
    return imag(conj(a)*b);
}

double dot_prod(const Point &a, const Point &b) {
    return real(conj(a)*b);
}

struct Line: public vector<Point> {
    Line() {}
    Line(const Point &a, const Point &b) {
        push_back(a);
        push_back(b);
    }
};

struct Circle {
    Point p;
    double r;
    Circle() {}
    Circle(const Point &p, const double r): p(p), r(r) {}
};

int main() {
    double x, y;
    scanf("%lf %lf", &x, &y);
    Point p1(x, y);

    scanf("%lf %lf", &x, &y);
    Point p2(x, y);

    Point e(real(p2)-real(p1), imag(p2)-imag(p1));
    e /= abs(e);

    size_t q;
    scanf("%zu", &q);
    for (size_t i=0; i<q; ++i) {
        double x, y;
        scanf("%lf %lf", &x, &y);
        Point p(x, y);

        double r=dot_prod(p-p1, e);
        Point h=p1+r*e;
        Point z=p+2.0*(h-p);
        printf("%.12f %.12f\n", real(z), imag(z));
    }

    return 0;
}