CountNumbers

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

namespace _7.CountNumbers
{
    class Program
    {
        static void Main(string[] args)
        {
            List<string> numbers = Console.ReadLine()
                .Split(' ')
                .ToList();

            numbers.Sort();
            int counter = 1;
            for (int i = 0; i < numbers.Count-1; i++)
            {
                 if(numbers[i] == numbers[i + 1])
                 {
                    counter++;
                    if (i == numbers.Count - 2)
                    {
                        Console.WriteLine($"{numbers[numbers.Count - 2]} -> {counter}");
                    }
                 }
                 else
                 {
                     Console.WriteLine($"{numbers[i]} -> {counter}");
                     counter = 1;
                    if (i == numbers.Count - 2)
                    {
                        Console.WriteLine($"{numbers[numbers.Count - 1]} -> {counter}");
                    }
                }



            }
        }
    }
}