using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        string input = "google";

        string outputstring = string.Empty;

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

            if(!outputstring.Contains(input[i]))                

            {

                outputstring +=input[i];

            }

        }

        Console.WriteLine(outputstring);

    }

}