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​

using System;

using System.Collections.Generic;

​

public class HelloWorld

{

    public static void Main(string[] args)

    {

        string str = "muthu";

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

        foreach(char c in str)

        {

            if(dic.ContainsKey(c))

            {

                dic[c]++;

            }

            else

            {

                dic[c] = 1;

            }

        }

        foreach(var d in dic)

        {

            Console.WriteLine($"{d.Key} and {d.Value}");

        }

    }

}