bkkk1

import java.util.*;

public class p06_Courses {
    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        String line = sc.nextLine();
        Map<String, List<String>> courses = new HashMap<>();
        Map<String, Integer> coursesByCount = new LinkedHashMap<>();

        while (!line.equals("end")){
            String[] tokens = line.split(" : ");

            String course = tokens[0];
            String name = tokens[1];

            courses.putIfAbsent(course, new ArrayList<>());
            courses.get(course).add(name);

            coursesByCount.putIfAbsent(course, 0);
            coursesByCount.put(course, coursesByCount.get(course) + 1);

            line = sc.nextLine();
        }

        coursesByCount.entrySet().stream()
                .sorted(Map.Entry.<String, Integer>comparingByValue()
                        .reversed())
                .forEach(pair-> {
                    System.out.printf("%s: %d%n", pair.getKey(), pair.getValue());
                    courses.get(pair.getKey()).stream()
                            .sorted((a, b) -> a.compareTo(b))
                            .forEach(x -> System.out.println("-- " + x));
                });





    }
}