import java.util.*;

public class Main {

    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);

        HashMap<String, List<String>> coursesMap=new HashMap<>();

        String strInput="";

        while(!(strInput=sc.nextLine()).equals("end")){
            String[] inpArr=strInput.split(" : ");
            String course=inpArr[0];
            String name=inpArr[1];

            coursesMap.putIfAbsent(course,new ArrayList<>());
            List<String> courseMembers=coursesMap.get(course);
            if (courseMembers.indexOf(name)<0){
                courseMembers.add(name);
            }
        }

        coursesMap.entrySet().stream()
                .sorted((e1,e2)->e2.getValue().size() - e1.getValue().size())
                .forEach(e->{
                    System.out.printf("%s: %d%n",e.getKey(),e.getValue().size());
                    e.getValue().stream()
                            .sorted()
                            .forEach(name-> System.out.printf("-- %s%n",name));

                });

    }
}