namespace Codeforces
{
    public class IOTester
	{
		private static readonly TextReader originalStdIn = Console.In;
		private static StringReader? stdIn;

		private static readonly TextWriter originalStdOut = Console.Out;
		private static StringWriter? stdOut;

		public static void Start()
		{
			stdOut = new StringWriter();
			Console.SetOut(stdOut);
		}

		public static void End()
		{
			stdOut = null;
			stdIn = null;
			Console.SetOut(originalStdOut);
			Console.SetIn(originalStdIn);
		}

		public static void SetInput(params string[] lines)
		{
			string input = string.Join(Environment.NewLine, lines);
			stdIn = new StringReader(input);
			Console.SetIn(stdIn);
		}

		public static string GetOutput()
		{
			if (stdOut == null)
			{
				return string.Empty;
			}
			else
			{
				return stdOut.ToString();
			}
		}

		public static string[] GetOutputLines()
		{
			return GetOutput().Split(Environment.NewLine).SkipLast(1).ToArray();
		}

		public static IList<string> GetOutputLinesAsList()
		{
			return new List<string>(GetOutputLines());
		}
	}
}