Given a file, this program is made to count the times of each character occurred in the file, make a list of each character and the times, print the result in the form (character, times) according to the decreasing order of 'times'.

You should type the file name after the cue when you are executing the code. The upper limit of the length of the file name shoule not be greater than 100 characters.

The unprintable charaters has been counted but not printed.