using System;

public class Program

{

    public static void Main()

    {

       string inputString="";

       char inputChar ;

       Console.WriteLine("Please input the string");

       inputString=Console.ReadLine();

       outer:

        Console.WriteLine("Please input the character which you want to count");

        string a =Console.ReadLine();

        if(a.Length==1)

        {

         inputChar =Convert.ToChar(a);

        }   

        else

        {

            Console.WriteLine("Wrong input only one character allowed");

            goto outer;

        }

       int count = GetLetterCountInSentence(inputChar, inputString);

       Console.WriteLine("letter {0} found {1} Times in '{2}'",inputChar,count, inputString);

       Console.ReadLine();

    }

    public static int GetLetterCountInSentence(char letter, string string2check)

        {

            int noOfTimes=0;

            for (int i = 0; i < string2check.Length; i++)

            {

                if (string2check[i] == letter)//if found, increase the count

                {

                    noOfTimes += 1; 

                }

            }

            return noOfTimes; //returns the count of noOfTimes

        }

}