#r "System"
#r "System.Text.Encoding"

using System.Text;

if (Args.Count == 0)
{
    Console.WriteLine("Usage: dotnet script base64Decode.csx <base64string>");
    return;
}

try
{
    string base64Encoded = Args[0];
    var base64Bytes = Convert.FromBase64String(base64Encoded);
    var decodedString = Encoding.UTF8.GetString(base64Bytes);

    Console.WriteLine("Decoded String: " + decodedString);
}
catch (FormatException)
{
    Console.WriteLine("Invalid Base64 string!");
}