Write a java program that prompts the user to enter a telephone number expressed in letters and outputs the corresponding telephone number in digits. If the user enters more than seven numbers, then process only the first seven letters. Also output the – (hyphen) after the third digit. Allow the user to uppercase and lowercase letters. Moreover, your program should process as many telephone numbers as the user wants.

To make telephone numbers easier to remember, some companies use letters to show their telephone
number. For example, the telephone number 438-5626 can be shown as GET-LOAN. In some cases,
to make a telephone number meaningful, companies might use more than seven letters. For example,
225-5466 can be displayed as CALL-HOME, which use eight letters.
Write a java program that prompts the user to enter a telephone number expressed in letters and outputs
the corresponding telephone number in digits. If the user enters more than seven numbers, then
process only the first seven letters. Also output the – (hyphen) after the third digit. Allow the user to
uppercase and lowercase letters. Moreover, your program should process as many telephone numbers
as the user wants.