考慮到四個人的移動對於重心偏移的貢獻相同，故沿重心偏移方向貪心走即可。

#include<bits/stdc++.h>
using namespace std;
typedef long double Double;
const Double eps=1e-25;
inline Double sqr(Double x){return x*x;}
inline double ip(){double x;scanf("%lf",&x);return x;}
inline void op(Double x,char c){printf("%.12lf%c",(double)x,c);}

struct point
{
    Double x,y;
    point() {}
    point(Double a,Double b) : x(a),y(b){}
    void in(){x=ip();y=ip();}
    void out(){op(x,' ');op(y,'\n');}
    #define cp const point &
    friend point operator + (cp a,cp b){return point(a.x+b.x,a.y+b.y);}
    friend point operator - (cp a,cp b){return point(a.x-b.x,a.y-b.y);}
    friend point operator * (cp a,Double b){return point(a.x*b,a.y*b);}
    Double len(){return sqrt(sqr(x)+sqr(y));}
}p[10],mid1,mid2,lk;

inline point unit(cp a)
{
    Double len=sqrt(sqr(a.x)+sqr(a.y));
    return point(a.x/len,a.y/len);
}

Double tot;

inline Double find(cp a,cp b,cp c)
{
    Double fm=(c.x-b.x)*lk.y+(b.y-c.y)*lk.x;
    if (fabs(fm)<eps) return 1e100;
    Double t=((c.y-b.y)*a.x+(b.x-c.x)*a.y+c.x*b.y-b.x*c.y)/fm;
    return t;
}

inline Double move(point &a)
{
    Double t,g[4]={find(a,p[5],p[6]),find(a,p[6],p[7]),find(a,p[7],p[8]),find(a,p[8],p[5])};
    sort(g,g+4);
    if (g[2]>1e90) t=g[1];
    else t=g[2];
	t=max(min(t,tot),(Double)0);
    a=a+lk*t;
    return t;
}

inline bool zero(point x){return fabs(x.x)<eps && fabs(x.y)<eps;}

inline void solve()
{
    for (int i=1;i<9;i++) p[i].in();
    bool flag=1;
    for (int i=1;i<9;i++) if (!zero(p[i])) flag=0;
    if (flag) exit(0);
    mid1=mid2=point(0,0);
    for (int i=1;i<5;i++) mid1=mid1+p[i];
    for (int i=5;i<9;i++) mid2=mid2+p[i];
    tot=(mid2-mid1).len();
    if (tot<eps)
    {
        for (int i=1;i<5;i++) p[i].out();
        return;
    }
    lk=unit(mid2-mid1);
    for (int i=1;i<5;i++) tot-=move(p[i]);
    for (int i=1;i<5;i++) p[i].out();
}

int main()
{
    while (1) solve(),puts("");
}