Unit 2 Task 28 - Stock on the shelf

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A shop starts with S items. Repeatedly ask how many were sold this hour (integer). Subtract from stock.

• If a sale would make stock negative, print Not enough stock and do not change stock.
• If the user enters 0 as sold, treat that as closing time and stop.
• When stock reaches 0, print Shelf empty and stop.

Print remaining stock whenever you like (e.g. after each valid sale).

Skills: while, guards on subtraction.