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Write a test program that prompts the user to enter a string and displays the num ber of letters in the string. *6.21 (Phone keypads) The international standard letterumber mapping for tele phones is given in Programming Exercise 4.15. Write a method that returns number, given an uppercase letter, as follows: public static int getNumber (char uppercaseLetter) Write a test program that prompts the user to enter a phone number as a string. The in number may contain letters. The program translates a letter (uppercase or lowerca to a digit and leaves all other characters intact. Here are sample runs of the prograrm Enter a string: 1-800-Flowers Enter 1-800-3569377 Enter a string: 1800f1owers Enter 18003569377