using System;
 
public class Test
{
	private static void Print(string msg)
	{
		Console.WriteLine(msg);
	}
 
	private static void t()
	{
		string s = null;
        try
        {
            s = s.TrimStart();
        }
        catch (Exception ex)
        {
            s = "";
            Print(ex.StackTrace);
            Print("----------------------------");
            throw;
        }
	}
 
	public static void Main()
	{
		try
		{
			t();
		}
		catch (Exception ex)
		{
			Print(ex.StackTrace);
		}
        Print(Environment.Version.ToString());
	}
}

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