#include <stdio.h>	
#include <stdlib.h>
#include <unistd.h>
#define	BUFFSIZE	8192

int main(void)
{
	int	n;
	char	buf[BUFFSIZE];
	while ( (n = read(STDIN_FILENO, buf, BUFFSIZE)) > 0)
		if (write(STDOUT_FILENO, buf, n) != n) {
			perror("write error");
      		exit(1);
    	}
	if (n < 0) { perror("read error"); exit(1); }
	exit(0);
}