Create a java class called Question4, and implement the following points inside the main method: 1. Reads a string from the standard input device and store it in a variable called inputStr. 2. Find all the letter characters in inputStr and store them in another string variable called letterChars. Then, convert all the characters in letterChars to uppercase characters (i.e., capital letters). 3. Display the contents of letterChars to the user using a message dialog box.

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