Calling virtual function in a parent/inherited class

I have the following code in C++:

#include <iostream>
using namespace std ;

class A{ 
public:
  void m1(){
    cout << "A" << endl;
  }
  virtual void m2(){
    cout << "A" << endl;
  }
  void m3(){
    cout << "A" << endl;
  }
};

class B: public A{ 
public:
  void m1(){
    cout << "B" << endl ;
  }
  virtual void m2(){
    cout << "B" << endl; 
  }
  virtual void m3(){
    cout << "B" << endl;
  }
};

int main(){
  A∗ p = new B() ;
  p−>m1() ; 
  p−>m2() ; 
  p−>m3() ;
}

What will each call in main() produce? I’m see that A B A, but don't know how to explain this in a detail.