using System;

public class Test
{
	public static void Main()
	{
		String str1 = "Hello";
        Console.WriteLine(str1);
        tell(str1);
        Console.WriteLine(str1);
        tellByRef(ref str1);
        Console.WriteLine(str1);
	}
	
	public static void tell(String str2) {
		str2 = "kdok123";
	}
	
	public static void tellByRef(ref String str3) {
		str3 = "kdok123";
	}
}