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:
x1,y1,x2,y2 = map(float, raw_input().split())

q = int(raw_input())
for _ in xrange(q):
  x,y = map(float, raw_input().split())
  if x1 == x2:
    print "%f %f" % (x1*2-x, y)
  elif y1 == y2:
    print "%f %f" % (x, y1*2-y)
  else:
    a0 = (y2 - y1) / (x2 - x1)
    b0 = y1 - a0 * x1
    ap = -1 / a0
    bp = y - ap * x
    xe = (bp - b0) / (a0 - ap)
    ye = a0 * xe + b0
    xe = xe + (xe - x)
    ye = ye + (ye - y)
    print "%.12f %.12f" % (xe, ye)