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<vector>
#include<math.h>
#include<iomanip>
using namespace std;
typedef long long ll;
typedef pair<ll,ll> P;
struct pnt{
    double x,y;
    pnt operator+(pnt key){
	pnt res; res.x=x+key.x,res.y=y+key.y;
	return res;
    }
    pnt operator-(pnt key){
	pnt res; res.x=x-key.x,res.y=y-key.y;
	return res;
    }
    pnt operator*(double key){
	pnt res; res.x=x*key,res.y=y*key;
	return res;
    }
    pnt operator/(double key){
	pnt res; res.x=x/key,res.y=y/key;
	return res;
    }
    double abs(){
	return sqrt(x*x+y*y);
    }
};
double dot(pnt a,pnt b){
    return a.x*b.x+a.y*b.y;
}
struct line{
    pnt a,b;
};
pnt projection(line p,pnt q){
    pnt base=p.b-p.a;
    pnt hypo=q-p.a;
    pnt res=p.a+base*dot(hypo,base)/base.abs()/base.abs();
    return res;
}
pnt reflection(line p,pnt q){
    pnt x=projection(p,q);
    return x*2-q;
}
int main(){
    line p;
    cin>>p.a.x>>p.a.y>>p.b.x>>p.b.y;
    ll n;cin>>n;
    while(n--){
	pnt q;
	cin>>q.x>>q.y;
	pnt res=reflection(p,q);
	cout<<fixed<<setprecision(9)<<res.x<<" ";
	cout<<fixed<<setprecision(9)<<res.y<<endl;
    }
    return 0;
}