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 CPP):

Solution:
#include<iostream>
#include<algorithm>
#include<stdio.h>
#include<cmath>
using namespace std;

int ax,ay,bx,by,becx,becy;
double s,c,kyori;

void solve(int x,int y){

    int becp,becq;
    becp=(x-ax);
    becq=(y-ay);

    double d= sqrt((double)becp*(double)becp+(double)becq*(double)becq);
    if(d==0) cout<<x<<" "<<y<<endl;
    else{
    double cc=((double)becx*(double)becp+(double)becy*(double)becq)/(d*kyori);
    double k = d*cc;
    double ansx,ansy;
    ansx=(double)ax+ k*c;
    ansy=(double)ay+ k*s;
    printf("%.8f %.8f\n",2*ansx-x, 2*ansy-y);
    }
}

int main(){

cin>>ax>>ay>>bx>>by;

kyori= sqrt(((double)ax-(double)bx)*((double)ax-(double)bx)+((double)ay-(double)by)*((double)ay-(double)by));
s=((double)by-(double)ay)/kyori;
c=((double)bx-(double)ax)/kyori;
becx=(bx-ax);
becy=(by-ay);
int n,x,y;
cin>>n;
for(int i=0;i<n;i++){
    cin>>x>>y;

    solve(x,y);
}

    return 0;
}