#include <bits/stdc++.h>

typedef long double ld;

using namespace std;

ld dist(ld x0,ld y0, ld x1, ld y2){
	return sqrt( (x0-x1)*(x0-x1)+(y0-y1)*(y0-y1)  );
}

int main()
{
    ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);
    
    ld ax,ay,bx,by,cx,cy,dx,dy;
    cin >>ax >>ay >> bx>>by>>cx>>cy>>dx>>dy;
    
    ld l = 0;
    ld r = max( dist(ax,ay,bx,by) , dist(cx,cy,dx,dy) );
    while(l<=r){
    	
    	ld mid1 = 
    	
    }

    return 0;
}