Print String Pattern in C#

Printing following pattern,

Input

NAGU

Output

NAGU AGU GU U ---- AGU GU U ---- GU U --- U

public class Program
{
    public static void Main()
    {
        Console.WriteLine("Enter the string");
        string inputString = Console.ReadLine().Trim().ToUpper();
        int length = inputString.Length;
        int index = length - 1;
        Console.WriteLine("Entered String : {0}", inputString);
        Console.WriteLine("The pattern is as below");
        Console.WriteLine("*******************");
        for (int i = 0; i < length; i++)
        {
            for (int j = i; j <= index; j++)
            {
                for (int k = j; k <= index; k++)
                {
                    Console.Write(inputString[k]);
                }
                Console.WriteLine();
            }
            Console.WriteLine("----------");
        }
        Console.ReadLine();
    }
}