def add_feature(input_dict):
    """
    Add a feature to Annotated Document Corpus.

    :param adc: Annotated Document Corpus
    :param feature_name: the name of new feature
    :param feature_values: list of features values
    :param feature_value_prefix:  prefix to feature value

    :return: new adc
    """
    for i, document in enumerate(input_dict['adc'].documents):
        document.features[input_dict['feature_name']] = input_dict[
            'feature_value_prefix'] + str(input_dict['feature_values'][i])
    return {'adc': input_dict['adc']}
