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Write a 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 letters, then process only the first seven letters.

Also output the $-($hyphen$)$ after the third digit.

Allow the user to use both uppercase and lowercase letters as well as spaces between words.

Moreover, your program should process as many telephone numbers as the user wants.

Use the dialpad below for reference:

The program should accept input and produce output similar to the example program execution below.

Enter Y$/$y to convert a telephone number from letters to digits. Enter any other letter to terminate the program. Y Enter a telephone number using letters: Hello world The corresponding telephone number is: $435-5696$ To process another telephone number, enter Y$/$y Enter any other letter to terminate the program.