using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Enter the string with duplicates to remove");

        //string input = Console.ReadLine();

        string[] sArray = {"a", "b", "b", "c", "c", "d", "e", "f", "f"};

        //char[] chArray = input.ToCharArray();

        //string output = string.Join("", chArray.Distinct().ToArray());

        string output = string.Join("", sArray.Distinct().ToArray());

        Console.WriteLine("String after removing duplicates: " +output);

    }

}