Average_Grades

import java.util.*;

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

        int n = Integer.parseInt(console.nextLine());

        Map<String, List<Double>> grades = new LinkedHashMap<>();
        for (int i = 0; i < n; i++) {
            String line = console.nextLine();
            String[] tokens = line.split("\\s+");
            String name = tokens[0];
            String[] asDigits = tokens[1].split("\\s+");

            List<Double> converted = new ArrayList<>(asDigits.length);

            for (int j = 0; j < asDigits.length; j++) {
                converted.add(Double.parseDouble(asDigits[j]));
            }

            if (!grades.containsKey(name)) {
                grades.put(name, new ArrayList<>());
            }
            grades.put(name, converted);
        }
        for (Map.Entry<String, List<Double>> entry : grades.entrySet()) {
            System.out.println(entry.getKey() + " -> " + entry.getValue());
        }
    }
}