String&Text - 21

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

namespace _21.PrintDiferentLetters
{
    class PrintDiferentLetters
    {
        /* Write a program that reads a string from the
         * console and prints all different letters in the
         * string along with information how many times each
         * letter is found.*/

        static void Main()
        {
            Console.Write("Please enteyr string : ");
            string inputString = Console.ReadLine().ToLower();
            string letters = "abcdefghijklmnopqrstuvwxyzABCDEFJHIGKLMNOPQRSTUVWXYZ";

            List<char> chars = new List<char>();
            List<int> counts = new List<int>();

            for (int i = 0; i < inputString.Length; i++)
			{
                int count = 0;
                if (letters.Contains(inputString[i] ))
                {
                    count = inputString.Split(inputString[i]).Length - 1;
                }
                else
                {
                    continue;
                }
                if (count != 0)
                {
                   chars.Add(inputString[i]) ;
                   counts.Add(count);
                   inputString = inputString.Replace(inputString[i], ' ');
                }
			}

            for (int i = 0; i < chars.Count; i++)
            {
                Console.WriteLine("{0} --> {1}", chars[i], counts[i]);
            }
        }
    }
}