You will receive a text command for a robot. Your task is it to convert the text command to a json string. Any action that is not valid must be ignored. Commands containing locations that are not available must be ignored
Available actions are: sit, stand, save_location, go_to_position, grab, drop.
Available locations are: living room, station.
Here are a few examples:

Text: Please sit down.
returns: {"action": "sit", "params": {}}
Text: Hey robot, I want you to go to the living room.
returns: {"action": "go_to_position", "params": {"location": "living room"}}
Text: Please save current location as bedroom
returns: {"action": "save_location", "params": {"location": "bedroom"}}
Text: Please grab the wrench
returns: {"action": "grab", "params": {"item": "wrench"}}
Text: Please drop the wrench
returns: {"action": "drop", "params": {}}
Text: Please do a backflip
returns: unknown command
Text: Please stand up
returns: