An automated library checkout machine allows library items to be scanned and processed. Each type of library item has a two-letter prefix code. The prefixes are defined in the table below:

A program is written to process these items at checkout. The program:

• Asks the librarian to enter the code for the type of item being checked out.
• Calls a prewritten function CheckItemCode() to verify whether the entered prefix code is valid.
• If the code is valid, the user is prompted to input the unique item number, which is concatenated with the prefix to form a unique SKU, and the function CheckoutItem() is called.

01  itemType = input("Enter the code for the item type:")
02  if CheckItemCode(itemType) then
03      itemNumber = input("Enter the unique item number:")
04      itemSKU = itemType + itemNumber
05      CheckoutItem(itemSKU)
06  endif