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>
using namespace std;

int main()
{
	int p1x = 0, p1y = 0, p2x = 0, p2y = 0, q = 0, px = 0, py = 0;
	int a = 0, b = 0;
	long c = 0, s = 0;
	double x = 0, y = 0;

	cin >> p1x >> p1y >> p2x >> p2y;
	cin >> q;

	a = p2y - p1y;
	b = p1x - p2x;
	c = - p1x * p2y + p1y * p2x;

	for (int i = 0; i < q; i++) {
		cin >> px >> py;

		s = a * px + b * py + c;
		x = px - 2 * (double)(s * a) / (double)(a * a + b * b);
		y = py - 2 * (double)(s * b) / (double)(a * a + b * b);

		cout << setprecision(10) << setiosflags(ios::fixed | ios::showpoint) 
			 << x << " " << y << endl;
	}
		
	return 0;
}