using System;

class Program
{
    static void Main()
    {
        Console.Write("Enter a string: ");
        string str = Console.ReadLine();

        Console.Write("Enter the starting index: ");
        int start = Convert.ToInt32(Console.ReadLine());

        Console.Write("Enter the length of substring: ");
        int length = Convert.ToInt32(Console.ReadLine());

        string sub = str.Substring(start, length);

        Console.WriteLine("Extracted Substring: " + sub);
    }
}