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:
sx, sy, ex, ey = (int(n) for n in input().split(" "))
trial = int(input())
for _ in range(trial):
    x, y = (int(n) for n in input().split(" "))
    if sx == ex:
        print(-x, y)
    elif sy == ey:
        print(x, -y)
    else:
        grad = (ey - sy) / (ex - sx)
        y_seg = sy - (grad * sx)
        per_grad = -1 / grad
        per_y_seg = y - (per_grad * x)
        ans_x = (y_seg - per_y_seg) / (-1 * (grad - per_grad))
        ans_y = per_grad * ans_x + per_y_seg
        diff_x = ans_x - x
        diff_y = diff_x * per_grad
        print(ans_x + diff_x, ans_y + diff_y)