Question: Write a program that prompts the user to enter a file name and displays the occurrences of each letter in the file. Letters are case-insensitive.

Write a program that prompts the user to enter a file name and displays the occurrences of each letter in the file. Letters are case-insensitive. Here is a sample run:

Enter a filename: Lincoln.txt Number of A's: 56 Number of B's: 134

Enter a filename: Lincoln.txt Number of A's: 56 Number of B's: 134 Number of Z's: 9 Enter

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