using System;
 
public class Test
{
	public static void Main()
	{
		string[] linhas = { "N0006 G90", "N0007 G90", "N0008 G92 X21.7301 Y88.9657",
		                    "N0009 S555", "N0010 D14", "N0011 G42 G01 X22.0659 Y89.3015",
		                    "N0012 X22.4194 Y89.655", "N0013 (PATHSTART0)",
		                    "N50000 G43 G017 X22O.0659 Y89.3015" };
 
		int contador = 0;
 
		foreach(string linha in linhas) {
			int espaco = linha.IndexOf(" "); // Quantidade de caracteres antes do espaço
			contador++;
 
			// Retorna os caracteres a partir do primeiro espaço
			string linhaIndexada = "N" + contador + linha.Substring(espaco); 
			Console.WriteLine(linhaIndexada);
		}
	}
}

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