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>
using namespace std;
#include<cstdio>
#include<complex>

typedef double type_n;
typedef complex<type_n> point;

int main()
{
    point a, b, c, z, h, w;
    int i, q;
    type_n a1, a2, b1, b2, z1, z2;
    scanf("%lf %lf %lf %lf", &a1, &a2, &b1, &b2);
    a.real(a1), a.imag(a2), b.real(b1), b.imag(b2);
    c = b - a;

    scanf("%d", &q);
    for(i = 0; i < q; i++){
        scanf("%lf %lf", &z1, &z2);
        z.real(z1), z.imag(z2);
        h = a + c * (((z - a) / c).real());
        w = h + h - z;
        printf("%.12f %.12f\n", w.real(), w.imag());
    }
    return 0;
}