#include <iostream>
#include <ostream>
#include <string>
#include <utility>
 
using namespace std;
 
struct Name { string s; Name(string s) : s(move(s)) { } };
 
struct A : virtual Name { A(string s) : Name(move(s)) { } };
 
struct B : virtual Name { B(string s) : Name(move(s)) { } };
 
struct C : A, B { C(string s) : A(string()), B(string()), Name(move(s)) { } };
 
C f() { return C("abcdefghijklmnopqrstuvwxyz"); }
 
int main()
{
    C c1("ABCDEFGHIJKLMNOPQRSTUVWXYZ");
    C c2("ABCDEFGHIJKLMNOPQRSTUVWXYZ");
    C ff = f();
    c1 = f();
    c2 = ff;
    cout << "C1 = " << c1.s << " " << "C2 = " << c2.s << "\n";
    return 0;
}

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