using System.Collections.Generic;
public static void Main()
var codigoInicial = "EMP2-SUS-ANC-1001";
var index = codigoInicial.LastIndexOf("-") +1;
var codigo = codigoInicial.Substring(0, index).Replace("ANC", "RNC") + 12360.ToString().PadLeft(4, '0');
Console.WriteLine(codigo);