Scanner scan = new Scanner(System.in);
        //Read file name.
        String filename = scan.nextLine();

        //Create output map.
        HashMap<String, Integer> map = new HashMap<>();
        BufferedReader br = null;
        String log;
        try {
            File input = new File(filename);
            br = new BufferedReader(new FileReader(input));
            while ((log = br.readLine()) != null) {
                String[] data = log.split(" ");
                map.put(data[0], map.getOrDefault(data[0], 0) + 1);
            }
        }catch(IOException e){
            e.printStackTrace();;
        }finally {
            if(br != null) {
                try {
                    br.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

        File output = new File( "record_" + filename);
        FileWriter writer = null;
        try {
            writer = new FileWriter("record_" + filename);
            for(Map.Entry<String, Integer> entry: map.entrySet()){
                writer.write(entry.getKey() + " " + entry.getValue() + "\n");
            }
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            if(writer != null){
                try {
                    writer.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }

            }
        }