using System;
using System.Text.RegularExpressions;

public class Test
{
	public static void Main()
	{
		var text = "Quick \"brown fox jumps \"over\" the lazy\" dog";
		var res = Regex.Replace(text, "(?<=^[^\"]*)\"|\"(?=[^\"]*$)", "\"\"\"");
		Console.WriteLine(res);
	}
}