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<vector>
#include<complex>
#include<cstdio>

using namespace std;

#define X real()
#define Y imag()

int main(){
	typedef complex<double> P;
	
	
	int a,b,c,d;
	cin>>a>>b>>c>>d;
	
	P padding = P(a,b);
	P p1 = P(0,0);
	P p2 = P(c-a, d-b);
	
	P e = p2 / abs(p2);
	
	int n;
	cin>>n;
	
	for(int i=0;i<n;i++){
		int g,h;
		cin>>g>>h;
		
		P q = P(g,h) - padding;
		
		double len = q.X*e.X + q.Y*e.Y;
		P pro = e*len;
		P ans = pro + (pro-q) + padding;
		
		printf("%.10lf %.10lf\n",ans.X, ans.Y);
		
	}
	
}