private void task_3(){
        int numOfStrings = 5;

        try{
            StringTokenizer tokenizer = new StringTokenizer(br.readLine());
            Map<String, Integer> repeatNum = new HashMap<String, Integer>();
            String[] stringsArray = new String[numOfStrings];
            StringJoiner joiner = null;
            boolean unique = true;

            for (String str:stringsArray) {
                str = tokenizer.nextToken();
                if (repeatNum.containsKey(str)) repeatNum.put(str,(repeatNum.get(str)+1));
                else repeatNum.put(str, 1);
            }

            for (Map.Entry<String, Integer> entry : repeatNum.entrySet()){
                if (entry.getValue() == 5){
                    unique = false;
                    joiner = new StringJoiner(", ");
                }
                else if (entry.getValue() > 1 && entry.getValue() < 5){
                    unique = false;
                    joiner = new StringJoiner(" ");
                }
                if (!unique){
                    for (int i = 0; i < entry.getValue() && entry.getValue() > 1; i++)
                        joiner.add(entry.getKey());
                }
            }

            if (unique) System.out.println("Все разные");
            else System.out.println(joiner.toString());
        }
        catch(Exception ex){
            System.out.println(ex.getMessage());
        }
    }