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

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 JEnter Number of As: 56 Number of Bs:

Enter a filename: Lincoln.txt JEnter Number of As: 56 Number of Bs: 134 Number of Zs: 9

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