package upmc.java;

class A {
  void m(A x, B y){System.out.println ("1");}
  void m(B x, A y){System.out.println ("2");}
}

class B extends A {
  void m(B x, B y){System.out.println ("3");}
}

class C extends B {
  void m(B x, B y){System.out.println ("4");}
  void m(C x, C y){System.out.println ("5");}
  void m(B x, A y){System.out.println ("6");}
}

public class Mariage 
{
  public static void main( String[] args )
  {
    A a1 = new A();
    B b1 = new B();
    C c1 = new C();
    A a2 = b1;
    A a3 = c1;
    B b2 = c1;

    a1.m(b1,c1);
    b1.m(b1,c1);
    c1.m(b1,c1);
    a1.m(a1,a1);

    a2.m(b1,c1);
    a3.m(b1,c1);
    b2.m(b1,c1);
    
    a1.m(b2,a3);
    a2.m(b2,a3);
    a3.m(b2,a3);

    a1.m(c1,b1);
    b1.m(c1,b1);
    b2.m(c1,b1);
    c1.m(c1,b1);
  }
}