using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

public class Program

{

    public static void Main()

    {

        string str ="parul";

        List<string> list = Substrings(str);

        for(int i=0; i<list.Count; i++)

        {

            Console.WriteLine(list[i]);

        }

        Console.Write(list.Count);

    }

    public static List<string> Substrings(string str)

    {

        List<string> list = new List<string>();

        for(int i=0; i<str.Length; i++)

        {

            string temp="";

            for(int j=i; j<str.Length; j++)

            {

                temp = temp + str[j];

                list.Add(temp);

            }

        }

        var result = list.Distinct();

        return result.ToList();

    }   

}

​