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 PYTHON3):

Solution:
import math

EPS = 1e-10

class Segment():
    def __init__(self, p1, p2):
        self.p1 = p1
        self.p2 = p2

class Point():
    def __init__(self, x, y):
        self.x = x
        self.y = y

    def __add__(self, point):
        # + 演算子での挙動を指定
        return Point(self.x+point.x, self.y+point.y)

    def __sub__(self, point):
        # - 演算子での挙動を指定
        return Point(self.x-point.x, self.y-point.y)

    def __mul__(self, a):
        # * 演算子での挙動を指定
        return Point(a*self.x, a*self.y)

    def __truediv__(self, a):
        # / 演算子での挙動を指定
        return Point(self.x/a, self.y/a)

    def __abs__(self):
        # abs関数での挙動を指定
        return math.sqrt(self.norm())

    def norm(self):
        return self.x**2+self.y**2

    def __eq__(self, point):
        # == 演算子での挙動を指定
        return abs(self.x-point.x) < EPS and abs(self.y-point.y) <EPS

def dot(a, b):
    return a.x*b.x+a.y*b.y

def cross(a, b):
    return a.x*b.y - a.y*b.x

def isOrthogonal(a, b):
    return dot(a, b) == 0

def isParallel(a, b):
    return cross(a, b) == 0

def project(s, p):
    #s: Segment(), p: Point()
    base = s.p2 - s.p1
    r = dot(p-s.p1, base)/base.norm()
    return s.p1+base*r

def reflect(s, p):
    return p+(project(s, p)-p)*2

if __name__ == '__main__':
    from sys import stdin
    input = stdin.readline

    x1, y1, x2, y2 = map(int, input().split())
    s = Segment(Point(x1, y1), Point(x2, y2))

    q = int(input())
    for _ in range(q):
        x0, y0 = map(int, input().split())
        p = Point(x0, y0)
        reflection = reflect(s, p)
        print(reflection.x, reflection.y)