using System;

public class Program

{

    public static void Main()

    {

        string s = "jdsfgdfg.sdgerg.wergherh";

        string first = s.Substring(0,s.LastIndexOf('.'));

        string last = s.Substring(s.LastIndexOf('.'));

        //string first2 = s[0..^s.LastIndexOf('.')];

        //string last2 = s[s.LastIndexOf('.')..];

        Console.WriteLine(first);

        Console.WriteLine(last);

        Console.WriteLine();

        //Console.WriteLine(first2);

        //Console.WriteLine(last2);

    }

}