#include <iostream>
#include <string>
using namespace std;

int main()
{
    string username = "";
    string password = "";
    bool success = false;
    int tries = 0;

    while (!success && tries < 2)
    {
        cout << "Enter username: ";
        cin >> username;

        cout << "Enter password: ";
        cin >> password;

        if (username == "doomguy")
        {
            if (password == "killalldemons")
            {
                cout << "Welcome, Doom Slayer!" << endl;
                success = true;
            }
            else
            {
                cout << "INVALID CREDENTIALS!" << endl;
            }
        }

        if (username == "billyblaze")
        {
            if (password == "killallnazis")
            {
                cout << "Welcome, B.J.!" << endl;
                success = true;
            }
            else
            {
                cout << "INVALID CREDENTIALS!" << endl;
            }
        }

        ++tries;
    }

    cout << "Goodbye!" << endl;

    return 0;
}