public static IntNode common(IntNode head1, IntNode head2)
	{
		if(head1==null) return head1;
		if(head2==null) return head2;
		if(head1.data!=head2.data){
			common(head1, head2.next);
		}else{
			IntNode s = new IntNode();
			s = head1;
			s.next = common(head1.next, head2);
			return s;
		}
	}