/* Ejercicio 1-20 */
#include <stdio.h>
#define MAXLINE 1000

int getline(char s[], int lim);
void detab(char s[]);
void copy(char to[], char from[]);

main()
{
	int len;
	char line[MAXLINE];

	while ((len = getline(line, MAXLINE)) > 0){
		detab(line);
		printf("%s", line);	
	}
	return 0;
}
void detab(char s[])
{
	int i = 0, j = 0;
	char nline[MAXLINE];
	while (s[i] != '\0'){
		if (s[i] != '\t'){
			nline[j] = s[i];
		}
		else {
			nline[j] = ' ';
			++j;
			nline[j] = ' ';
			++j;
			nline[j] = ' ';
		}
		++j;
		++i;
	}
	nline[j] = '\0';
	copy(s, nline);
}
int getline(char s[], int lim)
{
	int c, i;

	for (i=0; i<lim-1 && (c =getchar())!=EOF && c !='\n'; ++i)
		s[i] = c;
	if(c == '\n'){
		s[i] = c;
		++i;
	}
	s[i] = '\0';
	return i;
}
void copy(char to[], char from[])
{
	int i;

	i = 0;
	while ((to[i] = from[i]) != '\0')
		++i;
}