import sysitemsInBackpack $=["$book$",$ "computer", "keys", "travel mug"$]$while True: print$("$Would you like to:$")$ print$("1.$ Add an item to the backpack?"$)$ print$("2.$ Check if an item is in the backpack?"$)$ print$("3.$ Quit"$)$ userChoice $=$ input$()$ if$($userChoice $=="1")$: print$("$What item do you want to add to the backpack?"$)$ itemToAdd $=$ input$()$ ####### YOUR CODE HERE ###### #add the item to the backpack ####### YOUR CODE HERE ###### if$($userChoice $=="2")$: print$("$What item do you want to check to see if it is in the backpack?"$)$ itemToCheck $=$ input$()$ ####### YOUR CODE HERE ###### #Print out if the user's item is in the backpack ####### YOUR CODE HERE ###### if$($userChoice $=="3")$: sys$.$exit$()$