#include<iostream>
#include<math.h>
using namespace std;
class LINE;
class POINT{
int x,y,z;
friend LINE;
public:
POINT(){}
POINT(int a,int b,int c){
x=a,y=b,z=c;
cout<<"A"<<endl;
}
void print(){cout<<x<<","<<y<<","<<z<<endl;}
};
class LINE{
POINT a,b;
double length;
public:
LINE(int a1,int b1,int c1,int a2,int b2,int c2):a(a1,b1,c1),b(a2,b2,c2){
length=sqrt((a1-a2)*(a1-a2)+(b1-b2)*(b1-b2)+(c1-c2)*(c1-c2));
cout<<"B"<<endl;
}
LINE (POINT a,POINT b){
length=sqrt((a.x-b.x)*(a.x-b.x)+(a.y-b.y)*(a.y-b.y)+(a.z-b.z)*(a.z-b.z));
cout<<"C"<<endl;
}
void print(){
cout<<length<<endl;
}
};
void main(){
LINE line1(1,2,3,4,5,6);
line1.print();
POINT pt1(1,2,3),pt2(4,5,6);
LINE line2(pt1,pt2);
line2.print();
}
