package solution;


import java.util.*;
import java.util.stream.Collectors;

public class test {
    public static void main(String[] args) {
        ListNode head = new ListNode(1);
        head.next = new ListNode(1);
        head.next.next = new ListNode(1);
        head.next.next.next = new ListNode(2);

        ListNode result = Solution.deleteDuplicates(head);
        System.out.println(result.toString());
    }
}