#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);
}