Write a java program to accept a telephone number with any number of letters. The output should display a hyphen after first 3 digits and subsequently a hyphen (-) after very four digits. Also, modify the program to process as many telephone numbers as the user wants

code optimization: no unnecessary variables , if statements and counters

sample output screen shown with 3 cases(atleast one with blank spaces ect.)Descriptive block and inline comments include.

Thanks in advance