Write a function that will return a string of country codes from an argument that is a string of prices (containing dollar amounts following the country codes). your function will take as an argument a string of prices like the following: "us$40, au$89, jp$200". in this example, the function would return the string "us, au, jp". hint: you may want to break the original string into a list, manipulate the individual elements, then make it into a string again.