Remove Duplicates from Sorted List

Given a linked list containing only integers sorted in non-decreasing order, your task is to remove any duplicate elements and return the modified linked list with only distinct values. The linked list nodes are represented as space-separated integers followed by -1. Input format: - A single line containing integers representing the linked list followed by -1. Output format: - A single line of space-separated integers representing the linked list with duplicates removed. Example: Input: 1 1 2 3 3 -1 Output: 1 2 3