C# 2.1.Count_Chars_in_a_String

using System;
using System.Collections.Generic;

namespace _2._1.Count_Chars_in_a_String
{
    class Program
    {
        static void Main()
        {
            string word = Console.ReadLine();

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

            foreach (var currentChar in word)
            {
                if (currentChar != ' ')
                {
                    if (!histogram.ContainsKey(currentChar))
                    {
                        // histogram.Add(currentChar, 0);
                        histogram[currentChar] = 0;
                    }
                    histogram[currentChar]++;
                }
            }

            foreach (var item in histogram)
            {
                Console.WriteLine($"{item.Key} -> {item.Value}");
            }
        }
    }
}