def display_list(shopping_list):
    """Display all items in the shopping list"""
    # TODO: Your code here
    pass

def add_item(shopping_list, item):
    """Add item to list if not duplicate"""
    # TODO: Your code here
    pass

def remove_item(shopping_list, item_number):
    """Remove item at given position"""
    # TODO: Your code here
    pass

def main():
    shopping_list = []

    while True:
        print("\n=== SHOPPING LIST MANAGER ===")
        print("1. View list")
        print("2. Add item")
        print("3. Remove item")
        print("4. Clear list")
        print("5. Exit")

        choice = input("\nEnter choice: ")

        # TODO: Handle each choice

# Run the program
main()