using System;

​

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        Dictionary<char, int> characterCount = new Dictionary<char, int>();  

        String str ="Hello World";

    foreach (var character in str)  

    {  

        if (character != ' ')  

        {  

            if (!characterCount.ContainsKey(character))  

            {  

                characterCount.Add(character, 1);  

            }  

            else  

            {  

                characterCount[character]++;  

            }  

        }  

    }  

    foreach (var character in characterCount)  

    {  

        Console.WriteLine("{0} - {1}", character.Key, character.Value);  

    }  

    }

}