FuturisTech interview problem

Program.cs

/*
 * Write a function to read digits in the string. and then report the frecuency of each digit.
 * Then show digits sorted by frecuency, and their frecuency.
 * */

using System;
using System.Collections.Generic;
using System.Linq;
namespace FuturisTech
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Start");

            var s = "83798475678346512830974356837456";

            var digitsChar = s.ToCharArray();

            var frecuencies = new int[] { 0,0,0,0,0,0,0,0,0,0 };

            foreach( var digitChar in digitsChar)
            {
                var digit = Int32.Parse("" + digitChar);

                frecuencies[digit] = frecuencies[digit] + 1;
            }

            var cont = 0;
            foreach (var frecuency in frecuencies)
            {
                Console.WriteLine( "Number  "+ cont ++ + " has frecuency: "+ frecuency);
            }

            var dict = new Dictionary<int, int>();
            cont = 0;
            foreach (var frecuency in frecuencies)
            {
                dict.Add(cont++,frecuency);
            }

            //dict.ToList();

            var frecuencyTuples = dict.ToList(); // frecuencies.ToList<int>();
            //frecuencyTuples.Sort(new Comparison<KeyValuePair<int, int>>(( a,b ) => { return b.Value - a.Value; }) );
            frecuencyTuples.Sort((a, b) => { return b.Value - a.Value; });
            //var sortedByFrecuency = dict.

            foreach ( var frecuencyTuple in frecuencyTuples)
            {
                Console.WriteLine("Number: "+ frecuencyTuple.Key+" Frecuency: " + frecuencyTuple.Value);
            }


            Console.WriteLine("End");
        }
    }
}