Unit 3 Task 15 - Inventory commands

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Start with a dictionary of product name -> quantity (integers), e.g. {"pencil": 20, "eraser": 15}.

Loop reading commands:

• show - print all products and quantities.
• add PRODUCT QTY - split the line; increase that product’s count by QTY (assume product exists and QTY is a valid int).
• stop - exit the loop.

You may assume commands are well-formed for add.

Skills: dict mutation, split(), string commands.