Разиграна Листа

import java.util.Scanner;

public class RazigranaLista {

    public static void izbrishi(DLL<Character> list){
        DLLNode<Character> tmp;

        while(true) {
            tmp=list.getFirst();
            while (tmp != null) {
                tmp = tmp.succ;
                if (tmp == null)
                    break;
                DLLNode<Character> kopija = tmp;
                list.delete(tmp);
                tmp = kopija.succ;
            }
            if (list.length() == 1) {
                System.out.println(list);
                return;
            }
            DLLNode<Character> tmp2 = list.getLast();
            while (tmp2 != null) {
                tmp2 = tmp2.pred;
                if (tmp2 == null)
                    break;
                DLLNode<Character> kopija2 = tmp2;
                list.delete(tmp2);
                tmp2 = kopija2.pred;
            }
            if (list.length() == 1) {
                System.out.println(list);
                return;
            }
        }
    }
    public static void main(String[] args) {
        Scanner in=new Scanner(System.in);

        String line=in.nextLine();
        String[] parts=line.split(" ");
        DLL<Character> list=new DLL<>();

        for(int i=0;i<parts.length;i++){
            list.insertLast(parts[i].charAt(0));
        }
        izbrishi(list);
    }
}