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:
from math import sqrt
x1, y1, x2, y2 = map(int, raw_input().split())
dx = x2 - x1
dy = y2 - y1
for i in xrange(input()):
    x, y = map(int, raw_input().split())
    a = float(dx*(x - x1) + dy*(y - y1)) / (dx**2 + dy**2)
    print "%.09f %0.09f" % (2*x1 - x + 2*a*dx, 2*y1 - y + 2*a*dy)