Write a Python program called wdcount. py which uses a dictionary to count the number of occurrences of each word (ignoring case) in a pure text file encoding UTF-8. Note that the input text file name is given from the command line. To make it simple, you may assume that the file does not contain any punctuation characters. Your program should print each word along with its number of occurrences in descending order. That is the most frequent word should be printed first.