7. Count Numbers

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

namespace Practice
{
    class Program
    {
        static void Main()
        {
            List<int> list = Console.ReadLine().Split().Select(int.Parse).ToList();

            list.Sort();

            int currentNumber = int.MinValue;
            for (int i = 0; i < list.Count; i++)
            {
                int counter = 0;
                for (int j = 0; j < list.Count; j++)
                {
                    if (list[i] == list[j])
                    {
                        counter++;
                    }
                }

                if (list[i] != currentNumber)
                {
                    currentNumber = list[i];
                    Console.WriteLine("{0} -> {1}", currentNumber, counter);
                }
            }
        }
    }
}