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 <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i=0;i<n;++i)
typedef complex<double> Point;
#define X real()
#define Y imag()

double dot(Point a, Point b) {
	return a.X*b.X + a.Y*b.Y;
}

Point proj(Point a1, Point a2, Point p) {
	return a1 + dot(a2-a1, p-a1)/norm(a2-a1) * (a2-a1);
}

Point reflection(Point a1, Point a2, Point p) {
  return 2.0*proj(a1, a2, p) - p;
}

int main(void){
	double x1,y1,x2,y2,x,y;
	int q;
	cin>>x1>>y1>>x2>>y2>>q;
	rep(i,q){
		cin>>x>>y;
		Point p=reflection({x1,y1},{x2,y2},{x,y});
		printf("%.9f %.9f\n",p.X,p.Y);
	}
	return 0;
}