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>
using namespace std;
typedef complex<double> Point;

Point Rfl(Point z1, Point z2, Point z3) {
    Point z = (z3 - z1) / (z2 - z1);
    return (z2 - z1) * conj(z) + z1;
}

int main() {
    int n;
    double x1, y1, x2, y2, x3, y3;
    cin >> x1 >> y1 >> x2 >> y2 >> n;
    Point z1(x1, y1), z2(x2, y2);
    while (n--)
    {
        cin >> x3 >> y3;
        Point z3(x3, y3);
        Point p = Rfl(z1, z2, z3);
        cout << fixed << setprecision(10) << p.real() << " " << p.imag() << endl;
    }
    return 0;
}