Classes. C++ to D

[Dennis Ritchie via Digitalmars-d-learn]

Hi,
How can I rewrite this code to the D?

-----
#include <string>
#include <iostream>

class A {
     public:
     std::string a() {
         return std::string("foo");
     }
};

class B {
     public:
     std::string b(){
         return std::string("bar");
     }
};

class C : public A, public B {};

int main () {

     C c;

     std::cout << c.a() << c.b() << std::endl;

     return 0;
}