using System;

using System.Linq;              

public class SortDescending

{

    public static void Main()

    {  

        Console.WriteLine("Enter a string");

        String s =Console.ReadLine();

        char[] charArray=s.ToCharArray();

        var res=charArray.OrderByDescending(c=>c);

        foreach(char c in res){

            Console.Write(c);

        }

    }

}

​

​