data_bank = {"Jonathan" : "0213", "Ross": 'AsiansRS3xy'}
end = False
while (end == False):
    print 'Please print your username and password'

    username = raw_input('Username:')
    password = raw_input('Password:')

    if username in data_bank:
        if password == data_bank[username]:
            print 'ACCESS GRANTED'
            end = True
        else:
            print 'ACCESS DENIED'

    elif username == "Grandmaster Champion" and password == "Iamgod":
        print "Welcome Grandmaster Champion, please enter your new login information"
        new_username = raw_input('New Username:')
        new_password = raw_input('New Password:')
        data_bank[new_username] = new_password
        print "Your new information has been saved"

    elif username == "Destroyer of Worlds" and password == "Bomb":
        print 'Welcome J. Robert Oppenheimer, select the username you would like to destroy'
        old_username = raw_input("Username you would like to remove:")
        if old_username in data_bank:
            del data_bank[old_username]
        else:
            print 'User does not exist'
        print 'User has been destroyed, LET NO EVIDENCE ESCAPE'

    else:
        print 'User does not exist'