FinalSolution

import java.util.*;

public class Solution4 {

    public static void main(String[] args) {

        LinkedList<String> myList = new LinkedList<>(List.of("z", "z", "b", "a", "c", "c", "l"));
        ListIterator<String> listIterator = myList.listIterator();

        int count = 1;

        listIterator.next();

        while (listIterator.hasNext()) {

            String ch = listIterator.next();
            listIterator.previous();

            if (ch.equals(listIterator.previous())) {
                count++;
                listIterator.next();
                listIterator.next();
                listIterator.remove();
            } else {
                listIterator.next();
                if(count != 1) { // an thes na emfanizei kai to 1 vgale tin if i kanto true
                    listIterator.add(String.valueOf(count));
                }
                listIterator.next();
                count = 1;
            }

        }
        if (count != 1) listIterator.add(String.valueOf(count)); // an thes na emfanizei kai to 1 vgale tin if i kanto true
        myList.forEach(x -> System.out.print(x + " "));
    }
}