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public class List {
	Node head = null;
	
	public void insert(int val) {
		Node a = new Node(val);
		a.next = head;
		head = a;
	}
	
	public void delete(int val) {
		Node p = head;
		Node prev = null;
		while (p != null && p.val != val) {
			prev = p;
			p = p.next;
		}
	}
	
	public String toString() {
		if (head != null) {
			StringBuffer sb = new StringBuffer();
			Node tmp = head;
			while(tmp != null) {
				sb.append(tmp.toString() + " ");
				tmp = tmp.next;
			}
			return sb.toString();
		}
		else {
			return "List empty";
		}
	}
}

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public class Node {
	int val;
	Node next;
	
	public Node(int val) {
		this.val = val;
	}
	
	public String toString() {
			return (new Integer(val)).toString();
	}
}

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public class Main {
	
	public static void main (String [] args) {
		List list = new List();
		
		list.insert(6);
		list.insert(7);
		list.insert(8);
		list.insert(9);
		System.out.println(list);
	}	
}