using System;

using System.IO;

public class Program

{

    public static void Main()

    {

        var uploadedFile="textfddfgdtxt";

        var extension=Path.GetExtension(uploadedFile);

        Console.WriteLine(extension);

        Console.WriteLine(extension.Length);

        Console.WriteLine(uploadedFile[..(uploadedFile.Length-extension.Length)]);

    }

}