The letter e is the most frequently used letter in English prose, and the letter z is the least frequently used. A friend of yours doing a sociology experiment believes that this may not necessarily be true of the writings of first$-$year college students. To test his theory, he asks you to write a program that will take a text file and print, for each letter of the English alphabet, the number of times the letter appears in the file.Hint: Use an integer array of size $128,$ and use the ASCII values of letters to index into the array to store and retrieve counts for the letters. Note: Please at the top of the program: write a brief explanation of what this program intends to do$.$ Use sufficient comments to clarify the use of syntax. Use meaningful variable $($identifier$)$ in the program Separate input, process, and output instructions by a comment $($In$-$Process$-$Out$)*****$PLEASE WRITE THIS CODE IN C$++******$