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 PYTHON):

Solution:
# coding: utf-8
xp0,yp0,xp1,yp1 = map(float,raw_input().split())
q = int(raw_input())
for i in range(q):
    xp2,yp2 = map(float,raw_input().split())
    p0p2 = (xp2-xp0,yp2-yp0)
    p0p1 = (xp1-xp0,yp1-yp0)
    k = ((p0p2[0]*p0p1[0]+p0p2[1]*p0p1[1])/(p0p1[0]**2 + p0p1[1]**2))
    # p2t??¨p0p1????????????T??¨??????
    p0T = (k*p0p1[0],k*p0p1[1])
    OT = (xp0+p0T[0],yp0+p0T[1])
    p2t = (2*(OT[0]-xp2),2*(OT[1]-yp2))
    Ot =  (p2t[0] + xp2,p2t[1] + yp2)
    print "%.10f %.10f" % (Ot[0],Ot[1])