using System;
using System.Linq;
using System.Text.RegularExpressions;

public class Test
{
	public static void Main()
	{
		Console.WriteLine( string.Join("\n",
			Regex.Matches("Extract all words but word1 and word2.", @"\b(?!(?:word1|word2)\b)\w+")
				.Cast<Match>().Select(x=>x.Value))
			);
	}
}