Check for uncommon words and difficult words in file.

def run_check(self, data):
        """Check for uncommon words and difficult words in file."""
        if not data:
            sys.exit(1)
        data, sentences, chars, num_words = self.pre_check(data)
        w_dict = Counter(data)
        uniq_len, uncommon, uncom_len = self.gsl(w_dict)
        non_dchall_set = Counter({word: count for word, count in w_dict.items()
            if word and word not in self.dale_chall_words})
        diff_count = sum(non_dchall_set.values())
        dc_score = round(self.dale_chall(diff_count, num_words, sentences), 1)
        cli_score = round(self.coleman_liau(chars, num_words, sentences), 1)
        return uncommon, uncom_len, uniq_len, dc_score, cli_score