Read strings list$\_$name, list$\_$item$1,$ list$\_$item$2,$ and list$\_$item$3$ from input. Then assign groceries$\_$str with the concatenation of the following:

list$\_$name

$\text{'}$: $\text{'}$

list$\_$item$1$

$\text{'},\text{'}$

list$\_$item$2$

$\text{'},\text{'}$

list$\_$item$3$