username = ""
password = ""

while username != "MrDLeeman" or password != "Leemanb83":

    username = input("please enter your username: ")
    password = input ("Please enter your password: ")

    if username != "MrDLeeman" or password != "Leemanb83":
        print ("Incorrect username or password please retry")
        continue
    else:
        break

print("Correct username and password, please continue.")