The international standard letter/number mapping found on the telephone is shown below: Write a program that prompts the user to enter a lowercase or uppercase letter and displays its corresponding number. For a nonletter input, display an invalid input message. Here are sample runs:   Welcome to PhoneKeypad Mapping Program by Mrs Jackson   Enter a letter from phone keypad: 2 ** INVALID INPUT !!  ** ----------------------------------------------------------------------------------------------   Welcome to PhoneKeypad Mapping Program by Mrs. Jackson   Enter a letter from the phone keypad: F *The corresponding letter is 3

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