```ruby
module FormtasticBootstrap
  module Helpers
    module InputHelper
      include Formtastic::Helpers::InputHelper

      def input_class_with_const_defined(as)
        input_class_name = custom_input_class_name(as)

        if ::Object.const_defined?(input_class_name)
          input_class_name.constantize
        elsif FormtasticBootstrap::Inputs.const_defined?(input_class_name)
          standard_input_class_name(as).constantize
        elsif Formtastic::Inputs.const_defined?(input_class_name)
          standard_formtastic_class_name(as).constantize
        else
          raise Formtastic::UnknownInputError, "Unable to find input class #{input_class_name}"
        end
      end

      def standard_input_class_name(as)
        "FormtasticBootstrap::Inputs::#{as.to_s.camelize}Input"
      end

      def standard_formtastic_class_name(as)
        "Formtastic::Inputs::#{as.to_s.camelize}Input"
      end

    end
  end
end
```

Support for non standard input classes
user
```ruby
module FormtasticBootstrap
  module Helpers
    module InputHelper
      include Formtastic::Helpers::InputHelper

      def input_class_with_const_defined(as)
        input_class_name = custom_input_class_name(as)

        if ::Object.const_defined?(input_class_name)
          input_class_name.constantize
        elsif FormtasticBootstrap::Inputs.const_defined?(input_class_name)
          standard_input_class_name(as).constantize
        elsif Formtastic::Inputs.const_defined?(input_class_name)
          standard_formtastic_class_name(as).constantize
        else
          raise Formtastic::UnknownInputError, "Unable to find input class #{input_class_name}"
        end
      end
      
      def input_class_by_trying(as)
        begin
          custom_input_class_name(as).constantize
        rescue NameError
          begin
            standard_input_class_name(as).constantize
          rescue
            standard_formtastic_class_name(as).constantize
          end
        end
      rescue NameError
        raise Formtastic::UnknownInputError, "Unable to find input class for #{as}"
      end

      def standard_input_class_name(as)
        "FormtasticBootstrap::Inputs::#{as.to_s.camelize}Input"
      end

      def standard_formtastic_class_name(as)
        "Formtastic::Inputs::#{as.to_s.camelize}Input"
      end

    end
  end
end
```
assistant