using System;

​

public class Example

{

    public static void Main()

    {

        string searchString = ".";

        string s1 = "1.ssss.Limit.s" ;

       // string s2 = "animal";

        int a = s1.Length;

   int FirstOccurence = s1.IndexOf(searchString, 1,s1.Length-1);

      int SecondOccurence= s1.LastIndexOf(searchString);

 Console.WriteLine(s1.Substring(FirstOccurence+1,SecondOccurence-FirstOccurence-1));

        // The example displays the following output:

        //       4

        //       3

    }

}