//////////////////////////////////////////////////////////////////
//
//	printwords.cpp
//
//	Started by Jeff Ondich on 1/3/00
//	Last modified 1/11/00
//
//	This program retrieves words from standard input
//	until reaching end of file, printing all the words
//	(stripped of punctuation and made lower case)
//	to the screen.
//
//	1. Compile this program and try running it in
//		two different ways.
//
//		(a) Use gEdit to create a text file called
//			(for example) somefile.txt, with
//			any kind of text in it.  Then, at the
//			prompt, type:
//
//				printwords < somefile.txt
//
//		(b)	Type in response to the prompt:
//	
//				printwords
//
//			Then, type whatever bunch of words you
//			wish, on as many lines as you wish.  When
//			you're done typing, type CTRL-D at the
//			start of a new line.
//
//		2. Try running this program on input data
//			that includes a "word" that consists
//			entirely of digits and punctuation.
//			What does CleanWord() do to such a word?
//			How could you change the main program to
//			prevent the program from printing these
//			kinds of words?
//
//		3. You may use this program as a starting point
//			for Friday's assignment.  A good first goal
//			would be this:  what do you add to the main
//			program to enable you to count the words in
//			the input?  Good luck.
//
//////////////////////////////////////////////////////////////////

#include	<iostream>
#include	<string>

void CleanWord( string& theWord );

int main( void )
{
	string		word;
	
	while( cin >> word )
	{
		CleanWord( word );
		cout << word << endl;
	}

	return( 0 );
}



//////////////////////////////////////////////////////////////////
//
//	CleanWord removes all non-alphabetic characters
//	from the given string (except for hyphens and
//	apostrophes), and reduces all upper case letters
//	to lower case.  Thus, once CleanWord is done, theWord
//	consists entirely of lower case letters, hyphens,
//	and apostrophes.
//
//////////////////////////////////////////////////////////////////

void CleanWord( string& theWord )
{
	string	s = "";
	int		originalLength = theWord.length();
	
	for( int i=0; i < originalLength; i++ )
	{
		char	c = theWord[i];
		if( isalpha(c)  ||  c == '\''  ||  c == '-' )
			s += tolower(c);
	}

	theWord = s;
}