The international standard letter/number mapping for telephones is shown in Programming Exercise 4.15. Write a method that returns a number, given an uppercase letter, as follows:int?getNumber(char?uppercaseLetter)Write a test program that prompts the user to enter a phone number as a string. The input number may contain letters. The program translates a letter (uppercase or lowercase) to a digit and leaves all other characters intact. Here is a sample run of the program:

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JEnter Enter a string: 1-800-Flowers 1-800-3569377 Enter Enter a string: 1800flowers 18003569377 The international standard letter/number mapping found on the telephone is shown below: 2 obs 3 der 4 ghi 5 7pe 8 tuv 9wy Write a program that prompts the user to enter a letter and displays its corresponding number. Enter a letter: A Jenter The corresponding number is 2 Enter a letter: a -ester The corresponding number is 2 Enter a letter: + JEnter + is an invalid input