class ArrayList
{
  Object [] buf;
  int cur;
  ArrayList(int capacity)
  {
  }
  ArrayList()
  {
  }
  void insert( Object x )
  {
  }
  void remove( Object x )
  {
  }
  boolean isMember( Object x )
  {
  }
  Object objectAt( int i )
  {
  }
  int length()
  {
  }
  boolean equals( ArrayList l )
  {
  }
  String toString()
  {
  }
}

class LinkedList
{
  static class ListNode
  {
    Object info;
    ListNode next;
    ListNode(Object newInfo, ListNode newNext)
    {
      info = newInfo;
      next = newNext;
    }
  }
  ListNode head;
  LinkedList()
  {
  }
  void insert( Object x )
  {
  }
  void remove( Object x )
  {
  }
  boolean isMember( Object x )
  {
  }
  Object objectAt( int i )
  {
  }
  int length()
  {
  }
  int equals( LinkedList l )
  {
  }
  String toString()
  {
  }
}