//////////////////////////////////////////////////////////////////
//
//	printwords.cpp
//
//	Started by Jeff Ondich on 1/3/00
//	Last modified 1/3/00
//
//	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.
//
//	You can run this program in two ways:
//
//	(1)		printwords < somefile.txt
//
//	(2)		printwords
//
//	In the second case, you will type the input.  You
//	can type as many lines as you like.  To terminate
//	the input, type CTRL-D at the start of a new line.
//
//	Note that CleanWord might take the string it is 
//	given and clean it right out of existence.  What
//	could you change in main() to avoid printing empty
//	words?
//
//////////////////////////////////////////////////////////////////

#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;
}