Stock after sales

stock maps items to quantities and sales is a list of item names, one per item sold. Write after_sales(stock, sales) that reduces each sold item's quantity by one, changing stock itself, and returns it. Every sold item is in stock.

after_sales({"apple": 3, "bread": 2}, ["apple", "bread", "apple"])  ->  {"apple": 1, "bread": 1}

def after_sales(stock, sales):
    ...