/*
 * convert a tab-delimited stream into dm format
 */

#include <stdio.h>
#include <stdlib.h>

int skip = 0, nlines = 0;

void
Putchar(int c) {
	if (nlines >= skip)
		putchar(c);
	if (c == '\n')
		nlines++;
}

int
main(int argc, char **argv) {
	int c, lastc = EOF;

	if (argc > 1)
		skip = atoi(argv[1]);
	while ((c = getchar()) != EOF) {
		if (c == ' ') c = '_';
		switch (lastc) {
		case EOF:
		case '\t':
			if (c == '\t' || c == '\n') Putchar('_');
			break;
		}
		if (c == '\t')
			Putchar (' ');
		else
			Putchar (c);
		lastc = c;
	}
	exit (0);
}