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);
}