#include <iostream>
#include <utility>
using namespace std;
float A1(float x1, float x2)
{
return float(1/(x2-x1));
}
float B1(float y2, float y1)
{
return float(-(1/(y2-y1)));
}
float C1(float x1, float x2,float y2, float y1)
{
return float(-(x1*A1(x1, x2))+ y1*(-B1(y2, y1)));
}
float A2(float x3, float x4)
{
return float(1/(x4-x3));
}
float B2(float y4, float y3)
{
return float(-(1/(y4-y3)));
}
float C2(float x3, float x4,float y4, float y3)
{
return float(-(x3*A2(x3, x4))+ y3*(-B2(y4, y3)));
}
float Intersection(float x1,float x2,float x3,float y1,float y2,float y3,float x4,float y4)
{
pair<float , float > intersec;
intersec.first = float(-(C1(x1,x2,y2,y1)*B2(y4, y3)-C2(x3, x4, y4, y3)*B1(y2, y1))/(A1(x1, x2)*B2(y4, y3)-(A2(x3, x4)*B1(y2, y1))));
intersec.second = float(-(A1(x1, x2)-A2(x3, x4)*C1(x1, x2, y2, y1))/(A1(x1, x2)*B2(y4, y3)-A2(x3, x4)*B1(y2, y1)));
cout << intersec.first<<" quot;<<intersec.second<<endl;
};
int main(int argc, const char * argv[])
{
float x1, x2, x3, y1, y2, y3, x4, y4;
cin>>x1>>y1>>x2>>y2>>x3>>y3>>x4>>y4;
cout << C2(x3, x4, y4, y3);
return 0;
}
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