using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp37
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Unesi n:");
            int n = Convert.ToInt32(Console.ReadLine());

            List<string> adrese = new List<string>();
            List<int> x = new List<int>();
            List<int> y = new List<int>();

            Console.WriteLine("Unesi adrese i koordinate:");
            for (int i = 0; i < n * 2; i++)
            {
                if (i % 2 == 0)
                {
                    adrese.Add(Console.ReadLine().Trim());
                }
                else
                {
                    string str = Console.ReadLine();
                    x.Add(Convert.ToInt32(str.Substring(0, str.IndexOf(" "))));
                    y.Add(Convert.ToInt32(str.Substring(str.IndexOf(" "))));
                }
            }

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

            for (int i = 0; i < n; i++)
            {
                lokacije.Add(adrese[i], new List<double>());

                for (int j = 0; j < n; j++)
                {
                    lokacije[adrese[i]].Add(Math.Round(Math.Sqrt(Math.Pow(x[i] - x[j], 2) + Math.Pow(y[i] - y[j], 2)), 2));
                }
            }

            var prosek = lokacije.ToDictionary(s => s.Key, s => s.Value.Average()).OrderBy(s => s.Value).Select(z => z.Key).ToList();

            foreach(var p in prosek.Take(3))
            {
                Console.WriteLine(p);
            }
        }
    }
}