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

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

    def __add__(self,a):
        return self.__class__(self.x+a.x,self.y+a.y)

    def __sub__(self,a):
        return self.__class__(self.x-a.x,self.y-a.y)

    def __mul__(self,d):
        return self.__class__(self.x*d,self.y*d)

    def __truediv__(self,d):
        return self.__class__(self.x/d,self.y/d)

    def __str__(self):
        return '%.10f %.10f'%(self.x,self.y)

    def abs(self):
        return self.norm()**(1.0/2.0)

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

    def rotate(self,d):
        r = math.pi*d/180.0
        return self.__class__( self.x*math.cos(r)-self.y*math.sin(r),
                               self.x*math.sin(r)+self.y*math.cos(r))

    def dot(self,p):
        return (self.x*p.x+self.y*p.y)

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

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

def reflect(s,p):
    return p+(project(s,p)-p)*2.0

def main():
    a,b,c,d = map(float,input().split())
    s = Segment(Point(a,b),Point(c,d))
    q = int(input())
    for _ in range(q):
        e,f = map(float,input().split())
        p = Point(e,f)
        print (reflect(s,p))


if __name__ == '__main__':
    main()