using System;

namespace System
{
	extension String
	{
		public void Reverse()
		{
			int i = 0;
			int j = mLength - 1;
			while (i < j)
			{
				Swap!(Ptr[i++], Ptr[j--]);
			}
		}
	}
}

namespace StringReverse
{
	class Program
	{
		static void Main()
		{
			String s = scope .("abcdef");
			s.Reverse();
			Console.WriteLine(s);
		}
	}
}