using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Enter the valid string");

        string validStr = Console.ReadLine();

        string table=string.Empty;

        foreach(char val in validStr)

        {

            if(table.IndexOf(val)==-1){

                table+=val;

            }

        }

        Console.WriteLine("-----------------------------------------------Output----------");

        Console.WriteLine(table);

        Console.WriteLine("---------------------------------------------------------------");

    }

}