74. 假设已包含 <iostream>、<string>，且 std::cout、std::string 可直接写为 cout、string。有如下类定义:
class Person{
public:
Person(string s):name(s) {cout<<name; }
protected:
string name;
};
class Father: public Person{
public:
Father(string s):Person(s) {cout<<name<<"A";}
};
class Mother: public Person{
public:
Mother(string s):Person(s) {cout<<name<<"B"; }
};
class Child:public Father, public Mother{
public:
Child(string s1,string s2):Mother(s1), Father(s2) { }
};
若执行语句
Child r1("1","2");
则输出结果是______。
