#include<iostream>
#include<string>
using namespace std;
class Customer{
    protected:
    string name,password;
    public:
    void display(){
        cin >> name >> password;
    }
};
class Meter{
    protected:
    string role;
    public:
    void display1(){
        cin >> role;
    }
};
class Bill : public Meter , public Customer{
    public:
    void result(){
        if(name.empty()|| password.empty()||role.empty()){
            cout << "Invalid input";
            return;
        }
        cout << name << endl << role;
    }
};
int main(){
    Bill b;
    b.display();b.display();b.res();
    return 0;
}