using System;
public class Program
{
public static void Main()
Console.WriteLine("Hello World");
var responseNomor = "B001";
Console.WriteLine("Length");
Console.WriteLine(responseNomor.Length);
// var noAntre = responseNomor.Substring(responseNomor.Length - 2, responseNomor.Length);
Console.WriteLine(noAntre);
Console.ReadLine();
}