python

$(1)$ Prompt the user for a string that contains two strings separated by a comma.

$(2)$ Report an error if the input string does not contain a comma. Continue to prompt until a valid string is entered. Note: If the input contains a comma, then assume that the input also contains two strings.

$(3)$ Using string splitting, extract the two words from the input string and then remove any spaces. Output the two words.

$(4)$ Using a loop, extend the program to handle multiple lines of input. Continue until the user enters q to quit.