using System;

using System.Linq;

using System.Text.RegularExpressions;

​

//You are given a string... give me all the unique letters of that string.

//If given baseball... you should return b a s e l 

//Print the unique characters in one line

//Create a class for the computations

//Figure out the Big O Notations for this

​

public class MySorter

{

    public string DoSort(string input) {

        string answer = new String(input.Distinct().ToArray());

        //answer.Replace(" ", string.Empty);

        Regex.Replace(answer, @"\s+", "");

        return answer;

    }

}

​

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Enter a word? ");

        string myInput = Console.ReadLine();

        var x = new MySorter();

        var y = x.DoSort(myInput);

        Console.WriteLine("You entered " + myInput);

        Console.WriteLine("Unique letters are " + y);

    }

}