#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.display1();b.res();
    return 0;
}