using System;

​

public class Program

{

    public static void Main()

    {

        string sample = "lorem ipsum dolor sit amet, consectetur adipiscing elit; sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.";

        char? result = FirstNonRepeatedCharacter(sample);

        Console.WriteLine("'{0}' is the first non-repeated character in the string \"{1}\"", result, sample);

    }

    public static char? FirstNonRepeatedCharacter(string text) 

    {   

        return null;

    }

}