using System;
using System.Text.RegularExpressions;

public class Test
{
	public static void Main()
	{
		var pattern = @"(?i)(?<=^\w(?<c>\w)*) (\k<c>(?<-c>)\w+ ?|(?<w>\w+) ?)+$(?(c)(?!))";
        var input = new string[] {
            "RPM Package Manager",
            "Wine is not an emulator",
            "GNU is not Unix",
            "Golf is not an acronym",
            "X is a valid acronym"
        };

        var r = new Regex(pattern);
        foreach (var str in input)
        {
            var m = r.Match(str);
            Console.WriteLine(m.Success);
            for (int i = 0; i < m.Groups["w"].Captures.Count; ++i)
                Console.WriteLine(m.Groups["w"].Captures[i].Value);
        }
	}
}