using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Numerics;
using System.Runtime.CompilerServices;


namespace ConsoleApp9
{
    class Program
    {
        static void Main(string[] args)
        {
            var input = int.Parse(Console.ReadLine());
            var dict = new Dictionary<string,List<double>>();
            for (int i = 0; i < input; i++)
            {
                string[] command = Console.ReadLine().Split(" ",StringSplitOptions.RemoveEmptyEntries).ToArray();
                string name = command[0];
                double grade = double.Parse(command[1]);

                if (!dict.ContainsKey(name))
                {
                    dict.Add(name,new List<double>());

                }

                    dict[name].Add(grade);

            }


            foreach (var grades in dict)
            {

                Console.Write($"{grades.Key} -> ");
                foreach (var number in grades.Value)
                {
                    Console.Write($"{number:F2} ");

                }

                Console.Write($"(avg: {grades.Value.Average():F2})");
                Console.WriteLine();


            }

        }
    }
}