#include <stdio.h>

#include <stdlib.h>

#define MAXTABSTOPS 50

#define MAXLINECHARS 10000

void strpart(char * dest, const char *src, const int begin, const int end)

{

	int i;

	i=begin;

	while (i<=end)

	{

		dest[i-begin] = src[i];

		i++;

	}

	dest[i-begin] = '\0';

}

int main(int numarg, char **args)

{

	int tabstops[MAXTABSTOPS+1];

	int i,j;

	char original[MAXLINECHARS];

	char word[MAXLINECHARS];

	int this_tab_stop;

	int last_char;

	int reverse=0;	/* Funcionament normal */

	int num_tab_stops;

	int output_column;

	if (numarg<2)

	{

		printf("Bad Usage.\n");

		exit(1);

	}

	tabstops[0] = 0;

	tabstops[numarg] = MAXLINECHARS;

	num_tab_stops = 1;

	for (i=1; i<numarg; i++)

	{

		if (args[i][0] == '-')

			switch(args[i][1])

			{

			case 'r':

				reverse=1;

			}

		else

			tabstops[num_tab_stops++] = atoi(args[i])-1;

		/* Usually columns start at '1' */

		/* Not error-free in atoi! */

	}

	while(!feof(stdin))

	{

		fgets(original, MAXLINECHARS, stdin);

		if (feof(stdin)) break;

		if (reverse==0)

			this_tab_stop=0;

		else

			this_tab_stop=1;

		last_char=-1;

		if(reverse==0)

		{

			for(i=0; i<strlen(original); i++)

			{

				if(i == tabstops[this_tab_stop+1])

				{

					strpart(word, original, tabstops[this_tab_stop], last_char);

					printf("%s", word);

					if(this_tab_stop != num_tab_stops)	/* Ultim tab stop */

						putchar('\t');

					/* A pel proxim tab */

					last_char = tabstops[++this_tab_stop]-1;

				}

				if(original[i] != ' ')

					last_char = i;

			}

			/* Final de linia */

			strpart(word, original, tabstops[this_tab_stop], last_char);

			printf("%s", word);

		}

		else

		{

			this_tab_stop=1;

			output_column=1;

			for(i=0; i<strlen(original); i++)

			{

				if(original[i]=='\t' && this_tab_stop < num_tab_stops) 

				{

					for(j=output_column; j<=tabstops[this_tab_stop]; j++)

					{

						putchar(' ');

					}

					output_column = tabstops[this_tab_stop];

					this_tab_stop++;

				}

				else

					putchar(original[i]);

				output_column++;

			}

		}

	}

	exit(0);

}