Grocery shopping list (LinkedList) Given a ListItem class, complete main() using the built-in LinkedList type to create a linked list called shoppingList. The program should read items from input (ending with -1), adding each item to shoppingList, and output each item in shoppingList using the printNodeData() method.

Ex. If the input is:

milk
bread
eggs
waffles
cereal
-1

the output is:

milk
bread
eggs
waffles
cereal

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