using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text.RegularExpressions;

public class Test
{
	public static void Main()
	{
		Regex expr = new Regex(@"\Gab");
    	Console.WriteLine(expr.Match("ababab", 1)?.Success);
    	
    	Regex expr2 = new Regex(@"\Gab");
    	Console.WriteLine(expr2.Match("ababab", 2)?.Success);
	}
}