Question: 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

The international standard letter/number mapping found on the telephone is shown below:

100 2abc 3 def 4 ghi 5 ikl 6mno 7pgrs 8 tuv

Write a program that prompts the user to enter a lowercase or uppercase letter and displays its corresponding number. For a nonletter input, display invalid input.
Enter a letter: A
The corresponding number is 2
Enter a letter: a
The corresponding number is 2
Enter a letter: +
+ is an invalid input

100 2abc 3 def 4 ghi 5 ikl 6mno 7pgrs 8 tuv 9wxy **

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