using System.Globalization;

using static System.Console;

public class Program

{

    public static void Main()

    {                   

        WriteLine("Valor: {0}", StrCurrencyToDecimal("R$3.852,00"));

        WriteLine("Valor: {0}", StrCurrencyToDecimal("R$0,00"));

        WriteLine("Valor: {0}", StrCurrencyToDecimal("R$-3.852,00"));

        WriteLine("Valor: {0}", StrCurrencyToDecimal(""));

        WriteLine("Valor: {0}", StrCurrencyToDecimal("R3.852,00"));

        WriteLine("Valor: {0}", StrCurrencyToDecimal("$3.852,00"));

        WriteLine("Valor: {0}", StrCurrencyToDecimal("3.852,00"));

        WriteLine("Valor: {0}", StrCurrencyToDecimal("R$3ad.852,00"));

        WriteLine("Valor: {0}", StrCurrencyToDecimal("R$3,852.00"));

        WriteLine("Valor: {0}", StrCurrencyToDecimal("assR$3,852.00"));

    }       

    static decimal StrCurrencyToDecimal(string str)

    {

        NumberFormatInfo infoCurrency = new NumberFormatInfo();

        infoCurrency.NegativeSign = "-";

        infoCurrency.CurrencyDecimalSeparator = ",";

        infoCurrency.CurrencyGroupSeparator = ".";

        infoCurrency.CurrencySymbol = "R$";

        if (decimal.TryParse(str, NumberStyles.Currency, infoCurrency, out var result))     

            return result;      

        return -1;

    }

}