package com.company;

public class ListNode {
    int val;
    ListNode next;

    ListNode(int x) {
        val = x;
    }

    public ListNode deleteDuplicates(ListNode head) {
        while (head.next != null) {
            if (head.val == head.next.val) {
                head.next = head.next.next;
                continue;
            }
            head = head.next;
        }
        return null;
    }


    @Override
    public String toString() {
        if (next != null) {
            return val + ", " + next;
        } return val + "";
    }
}