class Lab6AQ3:
    @staticmethod
    def main():
        print("Inserting card!!!!")

        pin = input("Enter PIN: ")
        bal = 1000
        
        # correct PIN entered by the user
        if pin == "1234":
            accType = input("Enter Account Type: ")
            print("Opening Balance: $" + str(bal))
        # incorrect PIN entered by the user
        else:
            print("Invalid PIN. Removing card!!!!")

        # keep doing transactions when the correct PIN is entered by the user
        while pin == "1234":
            tcnType = input("Enter Transaction Type: ")
            # deposit transaction
            if tcnType == "D":
                depAmt = input("Enter Deposit Amount: $")
                bal += int(depAmt)
                print("Closing Balance: $" + str(bal))
                print("Transaction complete!!!!")
                print("Removing card!!!!")
                break # exit program
            # withdrawal transaction
            elif tcnType == "W":
                wdrAmt = input("Enter Withdrawal Amount: $")
                if int(wdrAmt) > bal:
                    print("Insufficient balance. Transaction cancelled!!!!")
                    print("Removing card!!!!")
                    break # exit program
                else:
                    bal -= int(wdrAmt)
                    print("Closing Balance: $" + str(bal))
                    print("Transaction complete!!!!")
                    print("Removing card!!!!")
                    break # exit program
            # invalid transaction type
            else:
                print("Error with selecting transaction. Try again!!!!")
                continue # go back to start of program

        print("Goodbye!!!!")

Lab6AQ3.main()