public static Map<Integer, List<Human>> ageDisplay(Set<Human>humanSet) // задание 10
    {
        Map<Integer, List<Human>> result = new TreeMap<>();
        List<Human> ageList = new ArrayList<>();
        for(Human value: humanSet)
        {
            if(result.containsKey(value.getAge()))
            {
                ageList.addAll(result.get(value.getAge()));
                ageList.add(value);
                result.put(value.getAge(), new ArrayList<>(ageList));
                ageList.clear();
            }
            else
            {
                result.put(value.getAge(), new ArrayList<>(Arrays.asList(value)));
            }
        }
        return result;
    }
    public static Map<Integer, Map<Character, List<Human>>> superDisplay(Set<Human>humanSet) //задание 11
    {

        Map<Integer, Map<Character, List<Human>>> ageAlphabeticalMap = new HashMap<>();
        Map<Character, List<Human>> alphabeticalMap = new TreeMap<>();
        Map<Integer, List<Human>> listMap = new TreeMap<>(ageDisplay(humanSet));
        List<Human> ageList = new ArrayList<>();
        for(Map.Entry<Integer, List<Human>> entry : listMap.entrySet())
        {
            for(Human value : entry.getValue())
            {
                if(alphabeticalMap.containsKey(value.getSurname().charAt(0)))
                {
                    ageList = alphabeticalMap.get(value.getSurname().charAt(0));
                    ageList.add(value);
                    Collections.sort(ageList, new Comparator<Human>() {
                        @Override
                        public int compare(Human a, Human b) {
                            return a.getSurname().compareTo(b.getSurname());
                        }
                    });
                    alphabeticalMap.put(value.getSurname().charAt(0), new ArrayList<>(ageList));
                    ageList.clear();
                }
                else
                {
                    alphabeticalMap.put(value.getSurname().charAt(0), new ArrayList<>(Arrays.asList(value)));
                }
            }
            ageAlphabeticalMap.put(entry.getKey(), new TreeMap<>(alphabeticalMap));
            alphabeticalMap.clear();
        }
        return ageAlphabeticalMap;
    }