using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text.RegularExpressions;
 
public class Test
{
	public static void Main()
	{
		string quote = "Underground; round; unstable; unique; queue";
		Regex negativeViewBackward = new Regex(@"\b(?!un)\w+\b", RegexOptions.IgnoreCase);
		List<string> result = negativeViewBackward.Matches(quote).Cast<Match>().Select(x => x.Value).ToList();
		foreach (var s in result)
        			Console.WriteLine(s);
	}
}

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