import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

public class Courses {

	public static void main(String[] args) throws IOException {

		BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
		Map<String, List<String>> data = new LinkedHashMap<String, List<String>>();

			String command = bf.readLine();

				while(!command.equals("end")){
					String input[] = command.split("[:]+");
					String course = input[0].trim();
					String student = input[1].trim();

						if(!data.containsKey(course)){
							data.put(course, new ArrayList<String>());
							data.get(course).add(student);
						}else{
							data.get(course).add(student);
						}
					command = bf.readLine();
				}


			data.entrySet().stream()
						  .sorted((a,b) -> {
							  return Integer.compare(b.getValue().size(), a.getValue().size()); // Sorting by size descendingly!
						  })
						  .forEach(a -> {
							  System.out.println(a.getKey() + ": " + a.getValue().size());    // Printing the course
							  a.getValue().stream().sorted().forEach(c -> System.out.println("-- "+ c)); // Streaming and sorting
						  });                                                                            // people in the course!







	}
}