using System;
using System.Collections.Generic;
using System.Linq;

namespace P02_AverageStudentsGrades
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());

            Dictionary<string, List<double>> students = new Dictionary<string, List<double>>();

            for (int i = 0; i < n; i++)
            {
                string[] input = Console.ReadLine().Split();
                string name = input[0];
                double grade = double.Parse(input[1]);

                if (!students.ContainsKey(name))
                {
                    students[name] =  new List<double>();
                }

                students[name].Add(grade);


            }



            foreach (var student in students)
            {
                string name = student.Key;
                var grades = student.Value;
                var average = grades.Average();

                Console.Write($"{name} -> ");

                foreach (var grade in grades)
                {
                    Console.Write("{0:F2} ", grade);
                }
                Console.Write($"(avg: {average:F2})");
                Console.WriteLine();
            }
        }
    }
}