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;

typedef complex<double> P;

P reflection(P a,P b,P c)
{
    b-=a;c-=a;
    return a+2.0*b*real(c/b)-c;
}

int main()
{
    double x1,y1,x2,y2;
    cin>>x1>>y1>>x2>>y2;

    int q;
    cin>>q;
    while(q--)
    {
        double x,y;
        cin>>x>>y;
        P p=reflection(P(x1,y1),P(x2,y2),P(x,y));
        cout<<fixed<<setprecision(10)<<p.real()<<" "<<p.imag()<<endl;
    }

    return 0;
}