// revpar - reverse a file by paragraphs
//
// Copyright (C) 1991,1994,2001,2002 by Jef Poskanzer <jef@mail.acme.com>.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
// OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
// SUCH DAMAGE.


#include <iostream>
#include <fstream>
#include <vector>
#include <string>
using namespace std;


static void readpars( istream& f );


typedef vector<string> LineVec;
typedef vector<LineVec> ParVec;
static ParVec pars;


int
main( int argc, char** argv )
    {
    if ( argc == 1 )
	readpars( cin );
    else
	for ( int i = 1; i < argc; ++i )
	    {
	    if ( strcmp( argv[i], "-" ) == 0 )
		readpars( cin );
	    else
		{
		ifstream f( argv[i] );
		if ( f.bad() )
		    {
		    cerr << argv[0] << ": error opening " << argv[i] << "\n";
		    exit( 1 );
		    }
		readpars( f );
		f.close();
		}
	    }

    for ( ParVec::reverse_iterator i = pars.rbegin(); i != pars.rend(); ++i )
	{
	if ( i != pars.rbegin() )
	    cout << "\n";
	for ( LineVec::iterator j = i->begin(); j != i->end(); ++j )
	    cout << *j << "\n";
	}

    exit( 0 );
    }


static void
readpars( istream& f )
    {
    char line[30000];
    LineVec lines;

    while ( f.getline( line, sizeof(line) ) )
	{
	/* Is it a blank line? */
	if ( line[0] == '\0' )
	    {
	    if ( lines.size() != 0 )	/* ignore multiple blank lines */
		{
		pars.push_back( lines );
		lines.clear();
		}
	    }
	else
	    lines.push_back( line );
	}

    /* Save last paragraph. */
    if ( lines.size() != 0 )
	pars.push_back( lines );
    }