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 <complex>
#include <cmath>

using Real = long double;
using Point = std::complex<Real>;
using Segment = std::pair<Point, Point>;

template <class T>
inline T sq(T x) { return x * x; }

inline Real length(Segment l) {
    return std::abs(l.second - l.first);
}

// 内積
inline Real prod(Point x, Point y) {
    return std::real(std::conj(x) * (y));
}

// lに対するxの正射影
Point proj(Segment l, Point p) {
    Real ratio = prod(l.second - l.first, p - l.first) / sq(length(l));
    return l.first + (l.second - l.first) * ratio;
}

// lを軸としてxに対称な点
Point refl(Segment l, Point p) {
    Point t = proj(l, p);
    return t + (t - p);
}

using namespace std;

int main() {
    cout << fixed << setprecision(10);

    Real x1, y1, x2, y2;
    cin >> x1 >> y1 >> x2 >> y2;
    Segment l(Point(x1, y1), Point(x2, y2));

    int Q;
    cin >> Q;
    for (int q = 0; q < Q; ++q) {
        Real x, y;
        cin >> x >> y;
        Point p(x, y);

        Point ret = refl(l, p);
        cout << ret.real() << " " << ret.imag() << endl;
    }
    return 0;
}