using System;

public class Program

{

    /*

         3 зад:

         Напишете програма, която открива колко пъти даден подниз се съдържа в текст. Например нека търсим подниза "e" в текста:

         We are living in a yellow submarine. We don't have anything else. Inside the submarine is very tight. So we are drinking all the day. We will move out of it in 5 days.

    */

    public static void Main()

    {

        string text = "We are living in a yellow submarine. We don't have anything else." + 

                      "Inside the submarine is very tight." + 

                      "So we are drinking all the day." +

                      "We will move out of it in 5 days.";

        string keyLetter = "e";

        int index = text.IndexOf(keyLetter);

        while (index != -1)

        {

             Console.WriteLine("Letter \"{0}\" found at index {1}", keyLetter, index);

             index = text.IndexOf(keyLetter, index + 1);

        }

    }

}