class Soup {
    private char buffer[] = new char[6];
    private int eatnext = 0;
    private int addnext = 0;
    private boolean isFull = false;
    private boolean isEmpty = true;

    public synchronized char eat() {
	char toReturn;
	while (isEmpty == true) {
	    try {
		wait();
	    } catch (InterruptedException e) {
	    }
	}
	toReturn = buffer[eatnext];
	eatnext = (eatnext + 1) % 6;
	if (eatnext == addnext ) {
	  isEmpty = true;
        }
	isFull=false;
	notifyAll();
	return(toReturn);
    }

    public synchronized void add(char c) {
	while (isFull == true) {
	    try {
		wait();
	    } catch (InterruptedException e) {
	    }
	}
	buffer[addnext] = c;
	addnext = (addnext + 1) % 6;
	if (addnext == eatnext) {
	  isFull = true;
	}
	isEmpty = false;
	notifyAll();
    }
}