///ZADANIE 3///
            System.out.println("\n///ZADANIE 3///\n");
            Map<String, String> artistRanking = new HashMap<>();
            fr = new FileReader(FILENAME2);
            br = new BufferedReader(fr);

            while ((sCurrentLine = br.readLine()) != null) {
                results = sCurrentLine.split("<SEP>");
                artistRanking.put(results[1], results[2]);
            }

            Map<String, Integer> grupedartistRanking = new HashMap<>();
            fr = new FileReader(FILENAME1);
            br = new BufferedReader(fr);
            while ((sCurrentLine = br.readLine()) != null) {
                results = sCurrentLine.split("<SEP>");
                String value =  artistRanking.get(results[1]);
                if(grupedartistRanking.get(value) == null){
                    grupedartistRanking.put(value, 1);
                }else{
                    int tempval = grupedartistRanking.get(value);
                    tempval++;
                    grupedartistRanking.put(value, tempval);
                }
            }

            key = Collections.max(grupedartistRanking.entrySet(), Map.Entry.comparingByValue()).getKey();
            System.out.println(key + " " + grupedartistRanking.get(key));