Implement the program which gets timetable and returns set of all lessons without duplicates. Timetable is a Map<String, List<String>>, where the key - the day of the week and the value - List<String> of lessons for that day.

public class LessonsGetter {
    public Set<String> getLessons(Map<String, List<String>> timetable){
    }
}

Input

Modnay - English
Tuesday - Mathematics
Wednesday - English, Chemistry
Thursday - Literature, Mathematics
Friday - Physics

Output

English, Mathematics, Chemistry, Literature, Physics

Implement the program which gets Map<String, Integer> as parameter and returns a new Map<Integer, Set<String>>, where key - the lengths of the key from the source map, value - Set<String> of keys with corresponding length.

public class MapFromKeysCreator {
    public Map<Integer, Set<String>> createMap(Map<String, Integer> sourceMap){
    }
}

Input

one - 1
two - 2
three - 3
five - 4
ten - 10

Output

3 - one, two, ten
4 - five
5 - three

Implement the program which gets Map<String, List<String>> of projects and its developers and the required developer as parameters and returns a List<String> of projects for requested developer in descending order of project name length. If the names of the projects are of the same length, then sort alphabetically in reverse order.

public class DeveloperProjectFinder {
    public List<String> findDeveloperProject(Map<String, Set<String>> projects, String developer){

    }
}

Input

Projects:
CSO - Ivan, Anna, Lidia, Antony
VVaS - Mary, Ben, Max, 
LJA - Oleg, Ivan, Alex
 
 Developer: Ivan

Output

CSO, LJA