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;

struct vec {
  double x, y;
  vec(double x, double y) : x(x), y(y) {}
  vec() : x(0), y(0) {}
  const vec operator+(const vec &v) const { return vec(x + v.x, y + v.y); }
  const vec operator-() const { return vec(-x, -y); }
  const vec operator-(const vec &v) const { return *this + (-v); }
  const vec operator*(const double d) const { return vec(x * d, y * d); }
  const vec operator/(const double d) const { return *this * (1 / d); }
  const vec unit() const { return *this / len(); };
  const double len() const { return sqrt(x * x + y * y); }
  const double dot(const vec &v) const { return x * v.x + y * v.y; }
};

typedef vec point;

point p1, p2;
vec v;

int main() {
  cin >> p1.x >> p1.y >> p2.x >> p2.y;
  v = p2 - p1;
  int q;
  cin >> q;
  for (int i = 0; i < q; i++) {
    point p;
    cin >> p.x >> p.y;
    vec v2 = p - p1;
    vec v3 = v.unit() * v.dot(v2) / v.len();
    point x = p1 + v3;
    point y = x + (x - p);
    printf("%.10lf %.10lf\n", y.x, y.y);
  }
}