Exercise P6.11. Flesch Readability Index. The following index [6] was invented by 
Flesch as a simple tool to gauge the legibility of a document without linguistic 
analysis.

. Count all words in the file. A word is any sequence of characters delimited by 
  white space, whether or not it is an actual English word.

. Count all syllables in each word. To make this simple, use the following rules:
  Each group of adjacent vowels {a,e,i,o,u,y} counts as one syllable (for example, 
  the "ea" in "real" contributes one syllable, but the "e..a" in "regal" count as two
  syllables). However, an "e" at the end of a word doesn't count as a syllable.
  Also, each word has at least one syllable, even if the previous rules give a 
  count of 0.

. Count all sentences. A sentence is ended by a period, colon, semicolon, question 
  mark, or exclamation mark.

. The index is computed by

     index = 206.835 - 84.6 x (Number of syllables / Number of words)

               - 1.015 x (Number of words / Number of sentences)

  rounded to the nearest integer.

This index is a number, usually between 0 and 100, indicating how difficult the text 
is to read. Some examples for random material for various publications are

	Comics 			95
	Consumer ads 		82
	Sports Illustrated 	65
	Time 			57
	New York Times 		39
	Auto insurance policy 	10
	Internal Revenue Code	-6

Translated into educational levels, the indices are

	91-100 		5th grader
	81-90 		6th grader
	71-80 		7th grader
	66-70 		8th grader
	61-66 		9th grader
	51-60 		High school student
	31-50 		College student
	0-30 		College graduate
	Less than 0	Law school graduate

The purpose of the index is to force authors to rewrite their text until the index is 
high enough. This is achieved by reducing the length of sentences and by removing 
long words. For example, the sentence

	The following index was invented by Flesch as a simple tool to estimate the legibility 
	of a document without linguistic analysis.

can be rewritten as

	Flesch invented an index to check whether a text is easy to read. To compute the index, 
	you need not look at the meaning of the words.

His book [7] contains delightful examples of translating government regulations into 
"plain English".

Your program should read in a text file, compute the legibility index, and print out 
the equivalent educational level.