Problem: For given three points p1, p2, p, find the reflection point x of p onto p1p2.

<image>

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 int long long   // <-----!!!!!!!!!!!!!!!!!!!

#define rep(i,n) for (int i=0;i<(n);i++)
#define rep2(i,a,b) for (int i=(a);i<(b);i++)
#define rrep(i,n) for (int i=(n)-1;i>=0;i--)
#define rrep2(i,a,b) for (int i=(b)-1;i>=(a);i--)
#define all(a) (a).begin(),(a).end()

typedef long long ll;
typedef pair<int, int> Pii;
typedef tuple<int, int, int> TUPLE;
typedef vector<int> V;
typedef vector<V> VV;
typedef vector<VV> VVV;

typedef complex<double> P;

double dot(P a, P b) {
    return real(conj(a) * b);
}

P projection(P x, P d) {
    return dot(x, d) * d / abs(d) / abs(d);
}

P reflection(P x, P d) {
    P t = projection(x, d);
    return 2. * t - x;
}

signed main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(0);

    double x0, y0, x1, y1;
    cin >> x0 >> y0 >> x1 >> y1;
    P p0(x0, y0), p1(x1, y1);
    int q;
    cin >> q;
    while (q--) {
        double x2, y2;
        cin >> x2 >> y2;
        P p2(x2, y2);
        P a = reflection(p2 - p0, p1 - p0) + p0;
        printf("%.10f %.10f\n", a.real(), a.imag());
    }

}