using System;

//code to find unique element in string

public class Program

{

    public static void Main()

    {

        string str="malayalam";

        string res="";

        foreach(char ch in str)

        {

            if(res.Contains(ch))

                continue;

            res=res+ch;

        }

        Console.WriteLine("Unique element in string "+str+" is-->"+res);

    }

}