Write a program that counts the occurrences if each letter in an array of characters. The program does the following: Generate twenty lowercase letters by the user or fr om the input file and assign them to an array of characters. Count the o ccurrences of each letter in the array. To count the occurrences of e ach letter in the array, create an array, say counts of twenty-six integer v alues, each of which counts the occurrences of a letter. That is, counts [0] counts the number of as, counts [1] counts the number of bs and so on. ( c++ using strings)