#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>


int main () {
	int ret, pid, i;
	int fd[2];
	char buf[5000];

	pipe (fd);
	pid = fork ();
	if (!pid) {
		close (fd[0]);
		for (i=0; i<3000; i++)
			buf[i] = 'A';
		write (fd[1], buf, 3000);
		for (i=0; i<10; i++)
			buf[i] = 'B';
		write (fd[1], buf, 3000);
		wait (NULL);
		wait (NULL);
	} else {
		close (fd[1]);
		pid = fork ();
		if (!pid) {
			nice (20);
			ret = read (fd[0], buf, 4000);
			buf[ret] = '\n';
			write (1, buf, ret+1);
		} else {
			ret = read (fd[0], buf, 10);
			buf[ret] = '\n';
			write (2, buf, ret+1);
		}
	} 
	return 0;
}