Scanner fromKey = new Scanner(System.in);

        List<String> lista = new ArrayList<String>();

        System.out.println("Unesite rečenicu:");
        do {
            String nekiString=fromKey.next();
            int i=0;
            lista.add(String.valueOf(nekiString.charAt(i)));
            i++;
        } while (System.in.equals("end") || System.in.equals("END"));

        int counter=0;
        if (fromKey.next().equals("end") || fromKey.next().equals("END")) {
            for (int i = 0; i < lista.size(); i++) {
                System.out.println(lista.get(i)"");

            }
        }
    }