/**
* The documentation is kept in the UNIX man page EndNoteTag.1 .
* @since 2007-06-13
* @author Richard J. Mathar
*/
#include <iostream>
#include <cstring>
#include <unistd.h>

using namespace std ;

/**
* @return 0 if successful, 1 if the syntax is not met.
* @since 2007-06-12
* @author Richard J. Mathar
*/
int main(int argc, char*argv[])
{

	/* command line option */
	int c ;

	/* 0 if EndNote standard input, 1 if RIS */
	int ristype =0 ;

	/* the length of the tag for RIS type inputs */
	int rislen = -1 ;

	while ( (c=getopt(argc,argv,"R")) != -1)
	{
		switch(c)
		{
		case 'R':
			ristype=1 ;
			break ;
		case '?':
			cerr << argv[0] << ": invalid command line option " << optarg << endl ;
			return 1 ;
		}
	}

	/* States 0 = noop, 1=replace, 2 =remove. Supposed we do not see any more
	* command line arguments, the default is noop for EndNote and remove for RIS.
	*/
	int state = ristype ? 2 : 0 ;

	if ( optind >= argc )
	{
		cerr << argv[0] << " needs at least one command line argument for useful operation\n" ;
		return 1 ;
	}

	/* for EndNote inputs, demand 1 or 2-letter command line arguments
	*/
	if ( ! ristype)
		for(int c = optind ; c < argc; c++)
		{
			if ( strlen(argv[c]) > 2+ristype )
			{
				cerr << argv[0] << " invalid length of argument " << argv[c] << endl ;
				return 1 ;
			}
		}

	/* loop over all lines of the standard input.
	*/
	while ( !cin.eof() )
	{
		string buf ;
		getline(cin,buf) ;

		/* Check if this starts a new tag. This is done naively: tags are all lines at least two characters long.
		* EndNote tags must start with a percent sign as the first character. RIS tags are any two characters
		* followed by one or two blanks (one blank is actually a non-standard faulty format), a dash and at
		* least one more blank.
		*/
		if ( buf.size() >= 2 )
		{
			/* try to autodetect the length of the RIS Tags */
			if (ristype && rislen < 0 ) 
			{
				/* search for the exact position of the RIS tag, independent on
				* how many blanks are between the tag and the dash.
				*/
				const int firstd = buf.find(" - ") ;
				if ( firstd != string::npos )
					rislen = firstd ;
			}

			if ( buf[0]  == '%' && !ristype || ristype && rislen >=0 && buf.compare(rislen,3," - ",3) == 0 )
			{
				/* reset state to default.
				*/
				state= ristype ? 2 : 0 ;
				for(int c=optind ; c < argc ; c++)
				{
					/* query whether this is a tag that is mentioned in the command line arguments.
					*/
					if ( ristype)
					{
						/* for RIS type inputs, command line arguments must be 3-letter words
						*/
						if ( strlen(argv[c]) != rislen+1 )
						{
							cerr << argv[0] << " invalid length of argument " << argv[c] << endl ;
							return 1 ;
						}

						/* search for the exact position of the RIS tag, independent on
						* how many blanks are between the tag and the dash.
						*/
						const int firstd = buf.find(" - ") ;
						if ( buf.compare(0,2,argv[c],2) == 0 )
						{
							buf.replace(0,1,"%") ;
							buf.replace(1,1+firstd,&argv[c][2]) ;
							state = 1 ;
						}
					}
					else
					{
						if ( buf[1] == argv[c][0] )
						{
							if ( strlen(argv[c]) == 1 )
								state = 2 ;
							else
							{
								state = 1 ;
								buf.replace(1,1,&argv[c][1]) ;
							}
						}
					}
				}
			}
		}
		/* blank lines reset the state */
		else if ( buf.size() == 0 )
		{
			state= ristype ? 2 : 0 ;
		}
	
		/* print potentially modified line
		*/
		if ( state != 2 )
			cout << buf << endl ;
	}
	return 0 ;
}