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 JAVA):

Solution:
import java.util.Scanner;

public class Main {
	
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		int xp1 = sc.nextInt();
		int yp1 = sc.nextInt();
		int xp2 = sc.nextInt();
		int yp2 = sc.nextInt();

		int q = sc.nextInt();
		for (int i = 0; i < q; i++) {
			int xp0 = sc.nextInt();
			int yp0 = sc.nextInt();

			int ax = xp2 - xp1;
			int ay = yp2 - yp1;
			int bx = xp0 - xp1;
			int by = yp0 - yp1;
			double dot = Geom.dot(ax, ay, bx, by);
			int a2 = Geom.sumofsquare(ax, ay);
			double x = dot / a2 * 2 * ax - bx + xp1;
			double y = dot / a2 * 2 * ay - by + yp1;
			
			System.out.printf("%.9f %.9f\n", x, y);
		}

		sc.close();
	}
	
	@SuppressWarnings("unused")
	private static class Geom {
		static int dot(int xa, int ya, int xb, int yb) {
			return xa * xb + ya * yb;
		}

		static int cross(int xa, int ya, int xb, int yb) {
			return xa * yb - xb * ya;
		}
		
		static int sumofsquare(int xa, int ya) {
			return xa * xa + ya * ya;
		}
	}
}