Characters that are not letters or digits should be ignored. Your program should use two arrays of integers. One should have 26 elements and is used to store a counter for each letter. The other array should have 10 elements and is used to store a counter for each digit.
Converts ch to lower case and subtract 'a' to determine the array offset for each letter .
Your program can either promt the user for a filename to process, or your program can read its input from cin. After the input has been processed your program should print a summary of the character counts, first the values for the letters and then the values for the digits. The output should be arranged in four columns.