public class ListNode {
    int val;
    ListNode next = null;

    ListNode(int val) {
        this.val = val;
    }
}
*/

import java.util.ArrayList;
public class  {

    public ListNode EntryNodeOfLoop(ListNode pHead)
    {
       ArrayList<ListNode> list = new ArrayList<ListNode>();
        if(pHead == null) return null;
        while(!list.contains(pHead)){
          list.add(pHead);
         pHead = pHead.next;
            if(pHead == null) return null;
        }
        return pHead;
    }
}