using System;

public class Program

{

    public static void Main()

    {

        int counter = 0;

        Console.WriteLine("Bitte satz eingeben");

        String input = Console.ReadLine();

        Console.WriteLine("Buchstabe eingeben");

        String searchedChar = Console.ReadLine();

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

        {

            if(input[i].ToString() == searchedChar)

            {

            counter++;

            }

        }

        Console.WriteLine(counter);

​

    }

}