Problem: For given three points p1, p2, p, find the reflection point x of p onto p1p2.

<image>

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 <bits/stdc++.h>
using namespace std;
#define mkp make_pair
#define rep(i,n) for(int i=0;i<(n);++i)
typedef long long ll;

const ll MOD=1e9+7;
const double EPS=1e-9;
const double PI=acos(-1.0);
//const long double PI=acos(-1.0L);

struct Point{
    double x,y;
    Point(){}
    Point(double x,double y):x(x),y(y){}

    Point operator +(const Point &b) const {return Point(x+b.x,y+b.y);}
    Point operator -(const Point &b) const {return Point(x-b.x,y-b.y);}
    Point operator *(const double b) const {return Point(x*b,y*b);}
    Point operator /(const double b) const {return Point(x/b,y/b);}
};

struct Line{
    Point a,b;
    Line(){}
    Line(Point a,Point b):a(a),b(b){}
};

double dot(const Point &a,const Point &b) {return (a.x*b.x+a.y*b.y);}
double cross(const Point &a,const Point &b) {return (a.x*b.y-a.y*b.x);}
double norm(const Point &p) {return dot(p,p);}
double abs(const Point &p) {return sqrt(norm(p));}

Point projection(const Point &p,const Line &l){
    double r=dot(p-l.a,l.b-l.a)/norm(l.b-l.a);
    return l.a+(l.b-l.a)*r;
}

Point reflection(const Point &p,const Line &l){
    return p+(projection(p,l)-p)*2;
}

int main(){
    Point P1,P2;
    cin>>P1.x>>P1.y>>P2.x>>P2.y;
    int Q;
    cin>>Q;

    Line L(P1,P2);
    for(int q=0;q<Q;q++){
        Point p;
        cin>>p.x>>p.y;

        Point ans=reflection(p,L);
        cout<<fixed<<setprecision(10)<<ans.x<<" "<<ans.y<<endl;
    }

    return 0;
}