using System.Collections;
using System.Collections.Generic;
public static void Main()
Dictionary<char,int>count=new Dictionary<char,int>();
string alphabet = "abcdefghijklmnopqrstuvwxyz";
string sentence = "This is an example bla bla blA";
foreach (char c in alphabet)
count.Add(c,sentence.ToLower().Count(ch => ch == c));
Console.WriteLine(c+"="+count[c]);