public String toString() {
		// Replace the following line with your solution.
		String stringvalue = "{";
		SListNode current = image.getHead();
		while (current != null) {
			stringvalue += "<";
			stringvalue += current.red + " ";
			stringvalue += current.green + " ";
			stringvalue += current.blue + " ";
			stringvalue += current.runlength + " ";
			stringvalue += ">,";
			current = current.next;
		}
		stringvalue += "}";
		return stringvalue;
	}