def simplify_config_key(config_key):
    """
    Example:
        Arguments:
            config_key: "config-env_config-is_shuffle_agents"
        Returns:
            "c-ec-isa"
    """
    config_key = config_key.replace("-", " - ")
    config_key = config_key.replace("_", " ")
    words = config_key.split()
    letters = [word[0] for word in words]
    return_ = "".join(letters)
    return return_