# A robot encounters a door. If the door is locked, the robot
# should be instructed to turn around.  If instead the door is
# unlocked, the robot should be instructed to open the door and
# enter the room. Note, before entering the robot should determine
# whether the light is off. If it is off, the robot should be
# instructed to first turn on the light.

# Get status of the door
reply = input( 'Door (locked / unlocked): ' )

# Put in standard format -- all lowercase
door_sensor = reply.strip().lower()

print()

# Based on door sensor take action
if ( door_sensor == 'locked' ) :
    # Cannot enter -- the door is locked
    print( 'Turn around.' )

else : # door_sensor is 'unlocked'
    # We can go in

    # Need to get status of light sensor

    light_sensor = input( 'Light is (on/off): ' )
    light_sensor = light_sensor.strip().lower() # call .strip() and .lower() on the light_sensor string

    if (light_sensor == 'on'):
        print( 'Enter the room.' )
    else: # light_sensor is 'off'
        print( 'Turn on the light.' )
        print('Enter the room.')  # This gets printed after we turn on the light

    # Alternative way
    # if ( light_sensor == 'off' ):
    #     print( 'Turn on the light' )
    # print( 'Enter the room' ) # This gets printed at the end whether the light is on or off because
    # if it's off we turn on the light then enter the room and if the light is already on
    # we just enter the room

    # Can enter because the door is open and the light is on

# All done

# Some E school classes do work with robots though! :)
# You can code up a robot and physically design it to do stuff.
# Computer Engineering students get to do stuff like that and it's super cool!
# But robots do work with conditional logic and concepts like the code above
# just a lot more complex :)