using System;

using System.Linq;

​

namespace LogicalPrograms

{

    class Program

    {

        static void Main(string[] args)

        {

           try{

                  string a = "binaryrepublik";

            string b = string.Empty;

​

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

            {

                if (!b.Contains(a[i]))

                {

                    b = b + a[i];

                }

            }

            Console.WriteLine(b);

​

           }

        catch(Exception e){

            Console.WriteLine(e);

        }

        }

    }

}