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>
#define rep(i,n) for(int i = 0, lim##__LINE__ = n; i < lim##__LINE__; ++i)
using C = std::complex<double>;

// CGL_1_A
C projection(C p, C p1, C p2) {
    return C(((p-p1) / (p2-p1)).real(), 0.0) * (p2-p1) + p1;
}

void solve_CGL_1_A() {
    int x1, y1, x2, y2;
    std::cin >> x1 >> y1 >> x2 >> y2;
    C p1(x1,y1), p2(x2,y2);
    int q;
    std::cin >> q;
    rep(i,q) {
        int x, y;
        std::cin >> x >> y;
        C p = C(x,y);
        C res = projection(p, p1, p2);
        printf("%.20lf %.20lf\n", res.real(), res.imag());
    }
}

// CGL_1_B
C reflection(C p, C p1, C p2) {
    return std::conj(((p-p1) / (p2-p1))) * (p2-p1) + p1;
}

void solve_CGL_1_B() {
    int x1, y1, x2, y2;
    std::cin >> x1 >> y1 >> x2 >> y2;
    C p1(x1,y1), p2(x2,y2);
    int q;
    std::cin >> q;
    rep(i,q) {
        int x, y;
        std::cin >> x >> y;
        C p = C(x,y);
        C res = reflection(p, p1, p2);
        printf("%.20lf %.20lf\n", res.real(), res.imag());
    }
}

int main() {
    solve_CGL_1_B();
}